Position within the page tree

English Website
Institute
Team
Portalupi, Simone Luca

Simone Luca Portalupi

Dr.

Gruppenleiter Halbleiteroptik
Institut für Halbleiteroptik und Funktionelle Grenzflächen
Semiconductor Optics Group

Contact

+49 711 685 65226
Email

Allmandring 3
70569 Stuttgart
Deutschland
Room: 0.044

Publications

2024
1. Michler, P., & Portalupi, S. L. (2024). Semiconductor Quantum Light Sources. De Gruyter. https://doi.org/doi:10.1515/9783110703412
  - BibTeX
  - Link
  BibTeX
  @book{MichlerPortalupi+2024, address = {Berlin, Boston}, author = {Michler, Peter and Portalupi, Simone Luca}, doi = {doi:10.1515/9783110703412}, isbn = {9783110703412}, publisher = {De Gruyter}, title = {Semiconductor Quantum Light Sources}, url = {https://doi.org/10.1515/9783110703412}, year = 2024 }
  Link
  https://doi.org/10.1515/9783110703412
2. Corcione, E., Jakob, F., Wagner, L., Joos, R., Bisquerra, A., Schmidt, M., Wieck, A. D., Ludwig, A., Jetter, M., Portalupi, S. L., Michler, P., & Tarín, C. (2024). Machine learning enhanced evaluation of semiconductor quantum dots. Scientific Reports, 14(1), Article 1. https://doi.org/10.1038/s41598-024-54615-7
  - BibTeX
  - Link
  BibTeX
  @article{Corcione2024, abstract = {A key challenge in quantum photonics today is the efficient and on-demand generation of high-quality single photons and entangled photon pairs. In this regard, one of the most promising types of emitters are semiconductor quantum dots, fluorescent nanostructures also described as artificial atoms. The main technological challenge in upscaling to an industrial level is the typically random spatial and spectral distribution in their growth. Furthermore, depending on the intended application, different requirements are imposed on a quantum dot, which are reflected in its spectral properties. Given that an in-depth suitability analysis is lengthy and costly, it is common practice to pre-select promising candidate quantum dots using their emission spectrum. Currently, this is done by hand. Therefore, to automate and expedite this process, in this paper, we propose a data-driven machine-learning-based method of evaluating the applicability of a semiconductor quantum dot as single photon source. For this, first, a minimally redundant, but maximally relevant feature representation for quantum dot emission spectra is derived by combining conventional spectral analysis with an autoencoding convolutional neural network. The obtained feature vector is subsequently used as input to a neural network regression model, which is specifically designed to not only return a rating score, gauging the technical suitability of a quantum dot, but also a measure of confidence for its evaluation. For training and testing, a large dataset of self-assembled InAs/GaAs semiconductor quantum dot emission spectra is used, partially labelled by a team of experts in the field. Overall, highly convincing results are achieved, as quantum dots are reliably evaluated correctly. Note, that the presented methodology can account for different spectral requirements and is applicable regardless of the underlying photonic structure, fabrication method and material composition. We therefore consider it the first step towards a fully integrated evaluation framework for quantum dots, proving the use of machine learning beneficial in the advancement of future quantum technologies.}, author = {Corcione, Emilio and Jakob, Fabian and Wagner, Lukas and Joos, Raphael and Bisquerra, Andre and Schmidt, Marcel and Wieck, Andreas D. and Ludwig, Arne and Jetter, Michael and Portalupi, Simone L. and Michler, Peter and Tar{\'i}n, Cristina}, day = 20, doi = {10.1038/s41598-024-54615-7}, issn = {2045-2322}, journal = {Scientific Reports}, month = {02}, number = 1, pages = 4154, title = {Machine learning enhanced evaluation of semiconductor quantum dots}, url = {https://doi.org/10.1038/s41598-024-54615-7}, volume = 14, year = 2024 }
  Link
  https://doi.org/10.1038/s41598-024-54615-7
3. Vijayan, P., Joos, R., Werner, M., Hirlinger-Alexander, J., Seibold, M., Vollmer, S., Sittig, R., Bauer, S., Braun, F., Portalupi, S., Jetter, M., & Michler, P. (2024). Growth of telecom C-band In(Ga)As quantum dots for silicon quantum photonics. Materials for Quantum Technology, 4. https://doi.org/10.1088/2633-4356/ad2522
  - BibTeX
  BibTeX
  @article{article, author = {Vijayan, Ponraj and Joos, Raphael and Werner, Marco and Hirlinger-Alexander, Jakob and Seibold, Matthias and Vollmer, Sergej and Sittig, Robert and Bauer, Stephanie and Braun, Fiona and Portalupi, Simone and Jetter, Michael and Michler, Peter}, doi = {10.1088/2633-4356/ad2522}, journal = {Materials for Quantum Technology}, month = {02}, title = {Growth of telecom C-band In(Ga)As quantum dots for silicon quantum photonics}, volume = 4, year = 2024 }
4. Hornung, F., Pfister, U., Bauer, S., Cyrlyson’s, D. R., Wang, D., Vijayan, P., Garcia Jr., A. J., Covre da Silva, S. F., Jetter, M., Portalupi, S. L., Rastelli, A., & Michler, P. (2024). Highly Indistinguishable Single Photons from Droplet-Etched GaAs Quantum Dots Integrated in Single-Mode Waveguides and Beamsplitters. Nano Lett., 24(4), Article 4. https://doi.org/10.1021/acs.nanolett.3c04010
  - BibTeX
  - Link
  BibTeX
  @article{hornungihfghighly, author = {Hornung, Florian and Pfister, Ulrich and Bauer, Stephanie and Cyrlyson’s, Dee Rocking and Wang, Dongze and Vijayan, Ponraj and Garcia Jr., Ailton J. and Covre da Silva, Saimon Filipe and Jetter, Michael and Portalupi, Simone L. and Rastelli, Armando and Michler, Peter}, doi = {10.1021/acs.nanolett.3c04010}, journal = {Nano Lett.}, language = {engl}, month = {01}, number = 4, pages = {1184–1190}, title = {Highly Indistinguishable Single Photons from Droplet-Etched GaAs Quantum Dots Integrated in Single-Mode Waveguides and Beamsplitters}, url = {https://pubs.acs.org/doi/full/10.1021/acs.nanolett.3c04010}, volume = 24, year = 2024 }
  Link
  https://pubs.acs.org/doi/full/10.1021/acs.nanolett.3c04010
5. Strobel, T., Kazmaier, S., Bauer, T., Schäfer, M., Choudhary, A., Sharma, N. L., Joos, R., Nawrath, C., Weber, J. H., Nie, W., Bhayani, G., Wagner, L., Bisquerra, A., Geitz, M., Braun, R.-P., Hopfmann, C., Portalupi, S. L., Becher, C., & Michler, P. (2024). High-fidelity distribution of triggered polarization-entangled telecom photons via a 36 km intra-city fiber network. Optica Quantum, 2(4), Article 4. https://doi.org/10.1364/OPTICAQ.530838
  - BibTeX
  - Link
  BibTeX
  @article{Strobel:24, abstract = {Fiber-based distribution of triggered, entangled, single-photon pairs is a key requirement for the future development of terrestrial quantum networks. In this context, semiconductor quantum dots (QDs) are promising candidates for deterministic sources of on-demand polarization-entangled photon pairs. So far, the best QD polarization-entangled-pair sources emit in the near-infrared wavelength regime, where the transmission distance in deployed fibers is limited. Here, to be compatible with existing fiber network infrastructures, bi-directional polarization-conserving quantum frequency conversion (QFC) is employed to convert the QD emission from 780 nm to telecom wavelengths. We show the preservation of polarization entanglement after QFC (fidelity to Bell state F $\varphi$ $+$,c o n v $=$0.972{\textpm}0.003) of the biexciton transition. As a step toward real-world applicability, high entanglement fidelities (F $\varphi$ $+$,l o o p $=$0.945{\textpm}0.005) after the propagation of one photon of the entangled pair along a 35.8 km field-installed standard single mode fiber link are reported. Furthermore, we successfully demonstrate a second polarization-conserving QFC step back to 780 nm preserving entanglement (F $\varphi$ $+$,b a c k $=$0.903{\textpm}0.005). This further prepares the way for interfacing quantum light to various quantum memories.}, author = {Strobel, Tim and Kazmaier, Stefan and Bauer, Tobias and Sch\"{a}fer, Marlon and Choudhary, Ankita and Sharma, Nand Lal and Joos, Raphael and Nawrath, Cornelius and Weber, Jonas H. and Nie, Weijie and Bhayani, Ghata and Wagner, Lukas and Bisquerra, Andr\'{e} and Geitz, Marc and Braun, Ralf-Peter and Hopfmann, Caspar and Portalupi, Simone L. and Becher, Christoph and Michler, Peter}, doi = {10.1364/OPTICAQ.530838}, journal = {Optica Quantum}, month = {08}, number = 4, pages = {274--281}, publisher = {Optica Publishing Group}, title = {High-fidelity distribution of triggered polarization-entangled telecom photons via a 36 km intra-city fiber network}, url = {https://opg.optica.org/opticaq/abstract.cfm?URI=opticaq-2-4-274}, volume = 2, year = 2024 }
  Link
  https://opg.optica.org/opticaq/abstract.cfm?URI=opticaq-2-4-274
6. Thomas, S. E., Wagner, L., Joos, R., Sittig, R., Nawrath, C., Burdekin, P., de Buy Wenniger, I. M., Rasiah, M. J., Huber-Loyola, T., Sagona-Stophel, S., Höfling, S., Jetter, M., Michler, P., Walmsley, I. A., Portalupi, S. L., & Ledingham, P. M. (2024). Deterministic storage and retrieval of telecom light from a quantum dot single-photon source interfaced with an atomic quantum memory. Science Advances, 10(15), Article 15. https://doi.org/10.1126/sciadv.adi7346
  - BibTeX
  - Link
  BibTeX
  @article{doi:10.1126/sciadv.adi7346, abstract = {A hybrid interface of solid-state single-photon sources and atomic quantum memories is a long sought-after goal in photonic quantum technologies. Here, we demonstrate deterministic storage and retrieval of light from a semiconductor quantum dot in an atomic ensemble quantum memory at telecommunications wavelengths. We store single photons from an indium arsenide quantum dot in a high-bandwidth rubidium vapor–based quantum memory, with a total internal memory efficiency of (12.9 ± 0.4)\%. The signal-to-noise ratio of the retrieved light field is 18.2 ± 0.6, limited only by detector dark counts. A quantum dot single-photon source and an atomic quantum memory are key interface components for future quantum networks.}, author = {Thomas, Sarah E. and Wagner, Lukas and Joos, Raphael and Sittig, Robert and Nawrath, Cornelius and Burdekin, Paul and de Buy Wenniger, Ilse Maillette and Rasiah, Mikhael J. and Huber-Loyola, Tobias and Sagona-Stophel, Steven and Höfling, Sven and Jetter, Michael and Michler, Peter and Walmsley, Ian A. and Portalupi, Simone L. and Ledingham, Patrick M.}, doi = {10.1126/sciadv.adi7346}, eprint = {https://www.science.org/doi/pdf/10.1126/sciadv.adi7346}, journal = {Science Advances}, number = 15, pages = {eadi7346}, title = {Deterministic storage and retrieval of telecom light from a quantum dot single-photon source interfaced with an atomic quantum memory}, url = {https://www.science.org/doi/abs/10.1126/sciadv.adi7346}, volume = 10, year = 2024 }
  Link
  https://www.science.org/doi/abs/10.1126/sciadv.adi7346
7. Yang, J., Jiang, Z., Benthin, F., Hanel, J., Fandrich, T., Joos, R., Bauer, S., Kolatschek, S., Hreibi, A., Rugeramigabo, E. P., Jetter, M., Portalupi, S. L., Zopf, M., Michler, P., Kück, S., & Ding, F. (2024). High-rate intercity quantum key distribution with a semiconductor single-photon source. Light: Science & Applications, 13(1), Article 1. https://doi.org/10.1038/s41377-024-01488-0
  - BibTeX
  - Link
  BibTeX
  @article{Yang2024, abstract = {Quantum key distribution (QKD) enables the transmission of information that is secure against general attacks by eavesdroppers. The use of on-demand quantum light sources in QKD protocols is expected to help improve security and maximum tolerable loss. Semiconductor quantum dots (QDs) are a promising building block for quantum communication applications because of the deterministic emission of single photons with high brightness and low multiphoton contribution. Here we report on the first intercity QKD experiment using a bright deterministic single photon source. A BB84 protocol based on polarisation encoding is realised using the high-rate single photons in the telecommunication C-band emitted from a semiconductor QD embedded in a circular Bragg grating structure. Utilising the 79{\thinspace}km long link with 25.49{\thinspace}dB loss (equivalent to 130{\thinspace}km for the direct-connected optical fibre) between the German cities of Hannover and Braunschweig, a record-high secret key bits per pulse of 4.8{\thinspace}{\texttimes}{\thinspace}10−5 with an average quantum bit error ratio of{\thinspace}{\textasciitilde}{\thinspace}0.65{\%} are demonstrated. An asymptotic maximum tolerable loss of 28.11{\thinspace}dB is found, corresponding to a length of 144{\thinspace}km of standard telecommunication fibre. Deterministic semiconductor sources therefore challenge state-of-the-art QKD protocols and have the potential to excel in measurement device independent protocols and quantum repeater applications.}, author = {Yang, Jingzhong and Jiang, Zenghui and Benthin, Frederik and Hanel, Joscha and Fandrich, Tom and Joos, Raphael and Bauer, Stephanie and Kolatschek, Sascha and Hreibi, Ali and Rugeramigabo, Eddy Patrick and Jetter, Michael and Portalupi, Simone Luca and Zopf, Michael and Michler, Peter and K{\"u}ck, Stefan and Ding, Fei}, day = 02, doi = {10.1038/s41377-024-01488-0}, issn = {2047-7538}, journal = {Light: Science {\&} Applications}, month = {07}, number = 1, pages = 150, title = {High-rate intercity quantum key distribution with a semiconductor single-photon source}, url = {https://doi.org/10.1038/s41377-024-01488-0}, volume = 13, year = 2024 }
  Link
  https://doi.org/10.1038/s41377-024-01488-0
8. Rodt, S., Vural, H., Portalupi, S. L., Michler, P., & Reitzenstein, S. (2024). Semiconductor quantum dot based quantum light sources. in “Quantum Photonics” in series “Photonic Materials and Application Series”, Eds. Y. Arakawa and D. Bimberg, Elsevier, 2024. https://elsev.spi-global.com/books/EComp/ARAKAWA978-0-323-98378-5/1/OTc4LTAtMzIz/index.php?Type=E
  - BibTeX
  - Link
  BibTeX
  @book{rodt2024semiconductor, abstract = {This chapter introduces the use of semiconductor quantum dots (QDs) as quantum light sources (QLS) for applications in quantum photonics technology. These quantum emitters have quasi-zero-dimensional carrier confinement and can function as near-ideal two- and three-level systems. This makes them ideal candidates for the realization of single-photon sources and entangled photon pair sources with high application potential in photon quantum technologies. In this context, we present advanced quantum device concepts, advanced growth techniques, and deterministic nanofabrication technologies for the realization of high-performance QLSs. The chapter also covers the hybrid device concept, where QDs interact with atoms, and practical aspects such as on-chip fiber coupling of a single-photon source for direct use in fiber-based quantum communication networks. As such, it provides an overview of the latest trends and findings for both experts and newcomers to the field. In addition, the chapter also sheds light on open questions and future directions of QD-based QLS.}, author = {Rodt, Sven and Vural, Hüseyin and Portalupi, Simone Luca and Michler, Peter and Reitzenstein, Stephan}, publisher = {in “Quantum Photonics” in series “Photonic Materials and Application Series”, Eds. Y. Arakawa and D. Bimberg, Elsevier, 2024}, title = {Semiconductor quantum dot based quantum light sources}, url = {https://elsev.spi-global.com/books/EComp/ARAKAWA978-0-323-98378-5/1/OTc4LTAtMzIz/index.php?Type=E}, year = 2024 }
  Link
  https://elsev.spi-global.com/books/EComp/ARAKAWA978-0-323-98378-5/1/OTc4LTAtMzIz/index.php?Type=E
9. Joos, R., Bauer, S., Rupp, C., Kolatschek, S., Fischer, W., Nawrath, C., Vijayan, P., Sittig, R., Jetter, M., Portalupi, S. L., & Michler, P. (2024). Coherently and Incoherently Pumped Telecom C-Band Single-Photon Source with High Brightness and Indistinguishability. Nano Letters, 24, 28. https://pubs.acs.org/doi/full/10.1021/acs.nanolett.4c01813
  - BibTeX
  - Link
  BibTeX
  @article{joos2024coherently, author = {Joos, Raphael and Bauer, Stephanie and Rupp, Christian and Kolatschek, Sascha and Fischer, Wolfgang and Nawrath, Cornelius and Vijayan, Ponraj and Sittig, Robert and Jetter, Michael and Portalupi, Simone L. and Michler, Peter}, journal = {Nano Letters}, month = {07}, pages = 28, title = {Coherently and Incoherently Pumped Telecom C-Band Single-Photon Source with High Brightness and Indistinguishability}, url = {https://pubs.acs.org/doi/full/10.1021/acs.nanolett.4c01813}, volume = 24, year = 2024 }
  Link
  https://pubs.acs.org/doi/full/10.1021/acs.nanolett.4c01813
2023
1. Engel, L., Kolatschek, S., Herzog, T., Vollmer, S., Jetter, M., Portalupi, S. L., & Michler, P. (2023). Purcell enhanced single-photon emission from a quantum dot coupled to a truncated Gaussian microcavity. Applied Physics Letters, 122(4), Article 4. https://doi.org/10.1063/5.0128631
  - BibTeX
  - Link
  BibTeX
  @article{doi:10.1063/5.0128631, abstract = { Purcell enhancement of quantum dot (QD) single-photon emission and increased device brightness have been demonstrated with various types of microcavities. Here, we present the first realization of a truncated Gaussian-shaped microcavity coupled to a QD. The implementation is based on wet-chemical etching and epitaxial semiconductor overgrowth. The cavity modes and their spatial profiles are experimentally studied and agree well with simulations. The fundamental mode wavelength with Q-factors around 6000 and a small polarization splitting of 29 μeV can be reproducibly controlled via fabrication design, enabling the adaption of the cavity to a specific QD. Finally, transitions of a QD inside a cavity are tuned on and off resonance via temperature tuning. A reduced decay time by a factor above 3 on resonance clearly indicates Purcell enhancement while second-order correlation measurements of g(2)(0) = 0.057 prove that the QDs single-photon characteristic is preserved. }, author = {Engel, Lena and Kolatschek, Sascha and Herzog, Thomas and Vollmer, Sergej and Jetter, Michael and Portalupi, Simone L. and Michler, Peter}, doi = {10.1063/5.0128631}, eprint = {https://doi.org/10.1063/5.0128631}, journal = {Applied Physics Letters}, number = 4, pages = 043503, title = {Purcell enhanced single-photon emission from a quantum dot coupled to a truncated Gaussian microcavity}, url = {/brokenurl# https://doi.org/10.1063/5.0128631 }, volume = 122, year = 2023 }
  Link
  /brokenurl# https://doi.org/10.1063/5.0128631
2. Strobel, T., Weber, J. H., Schmidt, M., Wagner, L., Engel, L., Jetter, M., Wieck, A. D., Portalupi, S. L., Ludwig, A., & Michler, P. (2023). A Unipolar Quantum Dot Diode Structure for Advanced Quantum Light Sources. Nano Letters, 23(14), Article 14. https://doi.org/10.1021/acs.nanolett.3c01658
  - BibTeX
  - Link
  BibTeX
  @article{Strobel_2023, author = {Strobel, Tim and Weber, Jonas H. and Schmidt, Marcel and Wagner, Lukas and Engel, Lena and Jetter, Michael and Wieck, Andreas D. and Portalupi, Simone L. and Ludwig, Arne and Michler, Peter}, doi = {10.1021/acs.nanolett.3c01658}, journal = {Nano Letters}, month = {07}, number = 14, pages = {6574--6580}, publisher = {American Chemical Society ({ACS})}, title = {A Unipolar Quantum Dot Diode Structure for Advanced Quantum Light Sources}, url = {https://doi.org/10.1021%2Facs.nanolett.3c01658}, volume = 23, year = 2023 }
  Link
  https://doi.org/10.1021%2Facs.nanolett.3c01658
3. Nawrath, C., Joos, R., Kolatschek, S., Bauer, S., Pruy, P., Hornung, F., Fischer, J., Huang, J., Vijayan, P., Sittig, R., Jetter, M., Portalupi, S. L., & Michler, P. (2023). Bright Source of Purcell-Enhanced, Triggered, Single Photons in the Telecom C-Band. Advanced Quantum Technologies. https://doi.org/10.1002/qute.202300111
  - BibTeX
  - Link
  BibTeX
  @article{nawrath2023bright, abstract = {Several emission features mark semiconductor quantum dots as promisingnon-classical light sources for prospective quantum implementations. Forlong-distance transmission and Si-based on-chip processing, the possibility tomatch the telecom C-band is decisive, while source brightness and highsingle-photon purity are key features in virtually any quantumimplementation. An InAs/InGaAs/GaAs quantum dot emitting in the telecomC-band coupled to a circular Bragg grating is presented here. This cavitystructure stands out due to its high broadband collection efficiency and highattainable Purcell factors. Here, simultaneously high brightness with afiber-coupled single-photon count rate of 13.9 MHz for an excitationrepetition rate of 228 MHz (first-lens single-photon collection efficiency≈17%for NA=0.6), while maintaining a low multi-photon contribution ofg(2)(0)=0.0052 is demonstrated. Moreover, the compatibility withtemperatures of up to 40 K attainable with compact cryo coolers, furtherunderlines the suitability for out-of-the-lab implementations}, author = {Nawrath, Cornelius and Joos, Raphael and Kolatschek, Sascha and Bauer, Stephanie and Pruy, Pascal and Hornung, Florian and Fischer, Julius and Huang, Jiasheng and Vijayan, Ponraj and Sittig, Robert and Jetter, Michael and Portalupi, Simone Luca and Michler, Peter}, issn = {2511-9044}, journal = {Advanced Quantum Technologies}, month = {08}, title = {Bright Source of Purcell-Enhanced, Triggered, Single Photons in the Telecom C-Band}, url = {https://doi.org/10.1002/qute.202300111}, year = 2023 }
  Link
  https://doi.org/10.1002/qute.202300111
4. Vyvlecka, M., Jehle, L., Nawrath, C., Giorgino, F., Bozzio, M., Sittig, R., Jetter, M., Portalupi, S. L., Michler, P., & Walther, P. (2023). Robust excitation of C-band quantum dots for quantum communication. Applied Physics Letters, 123(17), Article 17. https://doi.org/10.1063/5.0166285
  - BibTeX
  - Link
  BibTeX
  @article{Vyvlecka_2023, author = {Vyvlecka, Michal and Jehle, Lennart and Nawrath, Cornelius and Giorgino, Francesco and Bozzio, Mathieu and Sittig, Robert and Jetter, Michael and Portalupi, Simone L. and Michler, Peter and Walther, Philip}, doi = {10.1063/5.0166285}, journal = {Applied Physics Letters}, month = {10}, number = 17, publisher = {{AIP} Publishing}, title = {Robust excitation of C-band quantum dots for quantum communication}, url = {https://doi.org/10.1063%2F5.0166285}, volume = 123, year = 2023 }
  Link
  https://doi.org/10.1063%2F5.0166285
2022
1. Bozzio, M., Vyvlecka, M., Cosacchi, M., Nawrath, C., Seidelmann, T., Loredo, J. C., Portalupi, S. L., Axt, V. M., Michler, P., & Walther, P. (2022). Enhancing quantum cryptography with quantum dot single-photon sources. Npj Quantum Information, 8(1), Article 1. https://doi.org/10.1038/s41534-022-00626-z
  - BibTeX
  - Link
  BibTeX
  @article{Bozzio2022, abstract = {Quantum cryptography harnesses quantum light, in particular single photons, to provide security guarantees that cannot be reached by classical means. For each cryptographic task, the security feature of interest is directly related to the photons' non-classical properties. Quantum dot-based single-photon sources are remarkable candidates, as they can in principle emit deterministically, with high brightness and low multiphoton contribution. Here, we show that these sources provide additional security benefits, thanks to the tunability of coherence in the emitted photon-number states. We identify the optimal optical pumping scheme for the main quantum-cryptographic primitives, and benchmark their performance with respect to Poisson-distributed sources such as attenuated laser states and down-conversion sources. In particular, we elaborate on the advantage of using phonon-assisted and two-photon excitation rather than resonant excitation for quantum key distribution and other primitives. The presented results will guide future developments in solid-state and quantum information science for photon sources that are tailored to quantum communication tasks.}, author = {Bozzio, Mathieu and Vyvlecka, Michal and Cosacchi, Michael and Nawrath, Cornelius and Seidelmann, Tim and Loredo, Juan C. and Portalupi, Simone L. and Axt, Vollrath M. and Michler, Peter and Walther, Philip}, day = 08, doi = {10.1038/s41534-022-00626-z}, issn = {2056-6387}, journal = {npj Quantum Information}, month = {09}, number = 1, pages = 104, title = {Enhancing quantum cryptography with quantum dot single-photon sources}, url = {https://doi.org/10.1038/s41534-022-00626-z}, volume = 8, year = 2022 }
  Link
  https://doi.org/10.1038/s41534-022-00626-z
2. Dusanowski, Ł., Nawrath, C., Portalupi, S. L., Jetter, M., Huber, T., Klembt, S., Michler, P., & Höfling, S. (2022). Optical charge injection and coherent control of a quantum-dot spin-qubit emitting at telecom wavelengths. Nature Communications, 13(1), Article 1. https://doi.org/10.1038/s41467-022-28328-2
  - BibTeX
  - Link
  BibTeX
  @article{Dusanowski2022, abstract = {Solid-state quantum emitters with manipulable spin-qubits are promising platforms for quantum communication applications. Although such light-matter interfaces could be realized in many systems only a few allow for light emission in the telecom bands necessary for long-distance quantum networks. Here, we propose and implement an optically active solid-state spin-qubit based on a hole confined in a single InAs/GaAs quantum dot grown on an InGaAs metamorphic buffer layer emitting photons in the C-band. We lift the hole spin-degeneracy using an external magnetic field and demonstrate hole injection, initialization, read-out and complete coherent control using picosecond optical pulses. These results showcase a solid-state spin-qubit platform compatible with preexisting optical fiber networks.}, author = {Dusanowski, {\L}ukasz and Nawrath, Cornelius and Portalupi, Simone L. and Jetter, Michael and Huber, Tobias and Klembt, Sebastian and Michler, Peter and H{\"o}fling, Sven}, day = 08, doi = {10.1038/s41467-022-28328-2}, issn = {2041-1723}, journal = {Nature Communications}, month = {02}, number = 1, pages = 748, title = {Optical charge injection and coherent control of a quantum-dot spin-qubit emitting at telecom wavelengths}, url = {https://doi.org/10.1038/s41467-022-28328-2}, volume = 13, year = 2022 }
  Link
  https://doi.org/10.1038/s41467-022-28328-2
3. Sittig, R., Nawrath, C., Kolatschek, S., Bauer, S., Schaber, R., Huang, J., Vijayan, P., Pruy, P., Portalupi, S. L., Jetter, M., & Michler, P. (2022). Thin-film InGaAs metamorphic buffer for telecom C-band InAs quantum dots and optical resonators on GaAs platform. Nanophotonics. https://doi.org/doi:10.1515/nanoph-2021-0552
  - BibTeX
  - Link
  BibTeX
  @article{doi:10.1515/nanoph-2021-0552, abstract = {The GaAs-based material system is well-known for hosting InAs quantum dots (QDs) with outstanding optical properties, typically emitting at a wavelength of around 900 nm. The insertion of a metamorphic buffer (MMB) can shift this emission to the technologically attractive telecom C-band range centered at 1550 nm. However, the thickness of common MMB designs (>1 μm) limits their compatibility with most photonic resonator types. Here, we report on the metal–organic vapor-phase epitaxy (MOVPE) growth of a novel InGaAs MMB with a nonlinear indium content grading profile designed to maximize plastic relaxation within minimal layer thickness. This allows us to achieve the necessary transition of the lattice constant and to provide a smooth surface for QD growth within 180 nm. Single-photon emission at 1550 nm from InAs QDs deposited on top of this thin-film MMB is demonstrated. The strength of the new design is proven by integrating it into a bullseye cavity via nano-structuring techniques. The presented advances in the epitaxial growth of QD/MMB structures form the basis for the fabrication of high-quality telecom nonclassical light sources as a key component of photonic quantum technologies.}, author = {Sittig, Robert and Nawrath, Cornelius and Kolatschek, Sascha and Bauer, Stephanie and Schaber, Richard and Huang, Jiasheng and Vijayan, Ponraj and Pruy, Pascal and Portalupi, Simone Luca and Jetter, Michael and Michler, Peter}, doi = {doi:10.1515/nanoph-2021-0552}, journal = {Nanophotonics}, title = {Thin-film InGaAs metamorphic buffer for telecom C-band InAs quantum dots and optical resonators on GaAs platform}, url = {https://www.degruyter.com/document/doi/10.1515/nanoph-2021-0552/html}, year = 2022 }
  Link
  https://www.degruyter.com/document/doi/10.1515/nanoph-2021-0552/html
4. Ricciardi, A., Zimmer, M., Witz, N., Micco, A., Piccirillo, F., Giaquinto, M., Kaschel, M., Burghartz, J., Jetter, M., Michler, P., Cusano, A., & Portalupi, S. L. (2022). Integrated Optoelectronic Devices Using Lab-On-Fiber Technology. Advanced Materials Technologies, n/a(n/a), Article n/a. https://doi.org/10.1002/admt.202101681
  - BibTeX
  - Link
  BibTeX
  @article{https://doi.org/10.1002/admt.202101681, abstract = {Abstract Silica fibers are nowadays cornerstones in several technological implementations from long-distance communication, to sensing applications in many scenarios. To further enlarge the functionalities, the compactness, and the performances of fiber-based devices, one needs to reliably integrate small-footprint components such as sensors, light sources, and detectors onto single optical fiber substrates. Here, a novel proof of concept is presented to deterministically integrate optoelectronic chips onto the facet of an optical fiber, further implementing the electrical contacting between the chip and fiber itself. The CMOS-compatible procedure is based on a suitable combination of metal deposition, laser machining, and micromanipulation, directly applied onto the fiber tip. The proposed method is validated by transferring, aligning, and bonding a quantum-well based laser on the core of a multimode optical fiber. The successful monolithic device integration on fiber shows simultaneously electrical contacting between the laser and the ferrule, and 20\% light in-coupling in the fiber. These results pave new ways to develop the next generation of optoelectronic systems on fiber. The technological approach will set a new relevant milestone along the lab-on-fiber roadmap, opening new avenues for a novel class of integrated optoelectronic fiber platforms, featuring unrivaled miniaturization, compactness, and performances levels, designed for specific applications.}, author = {Ricciardi, Armando and Zimmer, Michael and Witz, Norbert and Micco, Alberto and Piccirillo, Federica and Giaquinto, Martino and Kaschel, Mathias and Burghartz, Joachim and Jetter, Michael and Michler, Peter and Cusano, Andrea and Portalupi, Simone Luca}, doi = {https://doi.org/10.1002/admt.202101681}, eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1002/admt.202101681}, journal = {Advanced Materials Technologies}, number = {n/a}, pages = 2101681, title = {Integrated Optoelectronic Devices Using Lab-On-Fiber Technology}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/admt.202101681}, volume = {n/a}, year = 2022 }
  Link
  https://onlinelibrary.wiley.com/doi/abs/10.1002/admt.202101681
2021
1. Nawrath, C., Vural, H., Fischer, J., Schaber, R., Portalupi, S. L., Jetter, M., & Michler, P. (2021). Resonance fluorescence of single In(Ga)As quantum dots emitting in the telecom C-band. Appl. Phys. Lett., 118(24), Article 24. https://doi.org/10.1063/5.0048695
  - BibTeX
  - Link
  BibTeX
  @article{nawrath2021resonance, abstract = {An emission wavelength around 1550 nm (telecom C-band) is highly appealing for nonclassical light sources, among others, due to the absorption minimum in standard glass fibers. In particular, sem...}, author = {Nawrath, C and Vural, H and Fischer, J and Schaber, R and Portalupi, S. L. and Jetter, M and Michler, P}, booktitle = {Applied Physics Letters}, comment = {doi: 10.1063/5.0048695}, doi = {10.1063/5.0048695}, issn = {00036951}, journal = {Appl. Phys. Lett.}, month = {06}, number = 24, pages = {244002--}, privnote = {doi: 10.1063/5.0048695}, publisher = {American Institute of Physics}, title = {Resonance fluorescence of single In(Ga)As quantum dots emitting in the telecom C-band}, url = {https://doi.org/10.1063/5.0048695}, volume = 118, year = 2021 }
  Link
  https://doi.org/10.1063/5.0048695
2. Sartison, M., Weber, K., Thiele, S., Bremer, L., Fischbach, S., Herzog, T., Kolatschek, S., Jetter, M., Reitzenstein, S., Herkommer, A., Michler, P., Portalupi, S. L., Giessen, H., & and. (2021). 3D printed micro-optics for quantum technology: Optimised coupling of single quantum dot emission into a single-mode fibre. Light: Advanced Manufacturing, 2(1), Article 1. https://doi.org/10.37188/lam.2021.006
  - BibTeX
  - Link
  BibTeX
  @article{Sartison_2021, author = {Sartison, Marc and Weber, Ksenia and Thiele, Simon and Bremer, Lucas and Fischbach, Sarah and Herzog, Thomas and Kolatschek, Sascha and Jetter, Michael and Reitzenstein, Stephan and Herkommer, Alois and Michler, Peter and Portalupi, Simone Luca and Giessen, Harald and and}, doi = {10.37188/lam.2021.006}, journal = {Light: Advanced Manufacturing}, number = 1, pages = {1--17}, publisher = {Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences}, title = {3D printed micro-optics for quantum technology: Optimised coupling of single quantum dot emission into a single-mode fibre}, url = {https://doi.org/10.37188%2Flam.2021.006}, volume = 2, year = 2021 }
  Link
  https://doi.org/10.37188%2Flam.2021.006
3. Michler, P., Portalupi, S., & Weber, J. (2021). Faserkollimator mit stirnseitig betätigbarer Fokussiereinheit und Kollimatorsystem. https://register.dpma.de/DPMAregister/pat/register?AKZ=1020190043529
  - BibTeX
  - Link
  BibTeX
  @patent{michler2021faserkollimator, author = {Michler, Peter and Portalupi, Simone and Weber, Jonas}, title = {Faserkollimator mit stirnseitig betätigbarer Fokussiereinheit und Kollimatorsystem}, url = {https://register.dpma.de/DPMAregister/pat/register?AKZ=1020190043529}, year = 2021 }
  Link
  https://register.dpma.de/DPMAregister/pat/register?AKZ=1020190043529
4. Kolatschek, S., Nawrath, C., Bauer, S., Huang, J., Fischer, J., Sittig, R., Jetter, M., Portalupi, S. L., & Michler, P. (2021). Bright Purcell Enhanced Single-Photon Source in the Telecom O-Band Based on a Quantum Dot in a Circular Bragg Grating. Nano Letters, 0(0), Article 0. https://doi.org/10.1021/acs.nanolett.1c02647
  - BibTeX
  - Link
  BibTeX
  @article{doi:10.1021/acs.nanolett.1c02647, abstract = { The combination of semiconductor quantum dots with photonic cavities is a promising way to realize nonclassical light sources with state-of-the-art performances regarding brightness, indistinguishability, and repetition rate. Here we demonstrate the coupling of InGaAs/GaAs QDs emitting in the telecom O-band to a circular Bragg grating cavity. We demonstrate a broadband geometric extraction efficiency enhancement by investigating two emission lines under above-band excitation, inside and detuned from the cavity mode, respectively. In the first case, a Purcell enhancement of 4 is attained. For the latter case, an end-to-end brightness of 1.4\% with a brightness at the first lens of 23\% is achieved. Using p-shell pumping, a combination of high count rate with pure single-photon emission (g(2)(0) = 0.01 in saturation) is achieved. Finally, a good single-photon purity (g(2)(0) = 0.13) together with a high detector count rate of 191 kcps is demonstrated for a temperature of up to 77 K. }, author = {Kolatschek, Sascha and Nawrath, Cornelius and Bauer, Stephanie and Huang, Jiasheng and Fischer, Julius and Sittig, Robert and Jetter, Michael and Portalupi, Simone Luca and Michler, Peter}, doi = {10.1021/acs.nanolett.1c02647}, eprint = {https://doi.org/10.1021/acs.nanolett.1c02647}, journal = {Nano Letters}, note = {PMID: 34478316}, number = 0, pages = {null}, title = {Bright Purcell Enhanced Single-Photon Source in the Telecom O-Band Based on a Quantum Dot in a Circular Bragg Grating}, url = {/brokenurl# https://doi.org/10.1021/acs.nanolett.1c02647 }, volume = 0, year = 2021 }
  Link
  /brokenurl# https://doi.org/10.1021/acs.nanolett.1c02647
5. Wang, Q., Maisch, J., Tang, F., Zhao, D., Yang, S., Joos, R., Portalupi, S. L., Michler, P., & Smet, J. H. (2021). Highly Polarized Single Photons from Strain-Induced Quasi-1D Localized Excitons in WSe2. Nano Letters, 21(17), Article 17. https://doi.org/10.1021/acs.nanolett.1c01927
  - BibTeX
  - Link
  BibTeX
  @article{doi:10.1021/acs.nanolett.1c01927, abstract = { Single photon emission from localized excitons in two-dimensional (2D) materials has been extensively investigated because of its relevance for quantum information applications. Prerequisites are the availability of photons with high purity polarization and controllable polarization orientation that can be integrated with optical cavities. Here, deformation strain along edges of prepatterned square-shaped substrate protrusions is exploited to induce quasi-one-dimensional (1D) localized excitons in WSe2 monolayers as an elegant way to get photons that fulfill these requirements. At zero magnetic field, the emission is linearly polarized with 95\% purity because exciton states are valley hybridized with equal shares of both valleys and predominant emission from excitons with a dipole moment along the elongated direction. In a strong field, one valley is favored and the linear polarization is converted to high-purity circular polarization. This deterministic control over polarization purity and orientation is a valuable asset in the context of integrated quantum photonics. }, author = {Wang, Qixing and Maisch, Julian and Tang, Fangdong and Zhao, Dong and Yang, Sheng and Joos, Raphael and Portalupi, Simone Luca and Michler, Peter and Smet, Jurgen H.}, doi = {10.1021/acs.nanolett.1c01927}, eprint = {https://doi.org/10.1021/acs.nanolett.1c01927}, journal = {Nano Letters}, note = {PMID: 34424710}, number = 17, pages = {7175-7182}, title = {Highly Polarized Single Photons from Strain-Induced Quasi-1D Localized Excitons in WSe2}, url = {/brokenurl# https://doi.org/10.1021/acs.nanolett.1c01927 }, volume = 21, year = 2021 }
  Link
  /brokenurl# https://doi.org/10.1021/acs.nanolett.1c01927
6. Bauer, S., Wang, D., Hoppe, N., Nawrath, C., Fischer, J., Witz, N., Kaschel, M., Schweikert, C., Jetter, M., Portalupi, S. L., Berroth, M., & Michler, P. (2021). Achieving stable fiber coupling of quantum dot telecom C-band single-photons to an SOI photonic device. Applied Physics Letters, 119(21), Article 21. https://doi.org/10.1063/5.0067749
  - BibTeX
  - Link
  BibTeX
  @article{doi:10.1063/5.0067749, abstract = { The well-established silicon-on-insulator platform is very promising for large-scale integrated photonic and quantum photonic technologies due to the mature manufacturing technology and integration density. Here, we present an efficient and stable fiber-to-chip coupling, which enables the injection of single photons from telecom quantum dots into a silicon-on-insulator photonic chip. Two additional fibers further couple the chip to single-photon detectors. The approach chosen to achieve steady fiber-chip coupling is based on the use of grating couplers steadily packaged with angled single-mode fibers. Using this technique, coupling efficiencies between the fiber and the SOI chip as high as 69.1\% per grating coupler (including the taper losses) are reached. The effective interface between the quantum light generated by quantum dots and the silicon components is verified via the measurement of the second-order correlation function using a Hanbury–Brown and Twiss setup. With g(2)(0)=0.051±0.001, it clearly proves the single-photon nature of the injected QD photons. This demonstrates the reliability of the interfacing method and opens the route to employ telecom quantum dots as non-classical light sources with high complexity silicon photonic functionalities. }, author = {Bauer, Stephanie and Wang, Dongze and Hoppe, Niklas and Nawrath, Cornelius and Fischer, Julius and Witz, Norbert and Kaschel, Mathias and Schweikert, Christian and Jetter, Michael and Portalupi, Simone L. and Berroth, Manfred and Michler, Peter}, doi = {10.1063/5.0067749}, eprint = {https://doi.org/10.1063/5.0067749}, journal = {Applied Physics Letters}, number = 21, pages = 211101, title = {Achieving stable fiber coupling of quantum dot telecom C-band single-photons to an SOI photonic device}, url = {/brokenurl# https://doi.org/10.1063/5.0067749 }, volume = 119, year = 2021 }
  Link
  /brokenurl# https://doi.org/10.1063/5.0067749
7. Vural, H., Seyfferle, S., Gerhardt, I., Jetter, M., Portalupi, S. L., & Michler, P. (2021). Delaying two-photon Fock states in hot cesium vapor using single photons generated on demand from a semiconductor quantum dot. Phys. Rev. B, 103(19), Article 19. https://doi.org/10.1103/PhysRevB.103.195304
  - BibTeX
  - Link
  BibTeX
  @article{PhysRevB.103.195304, author = {Vural, H. and Seyfferle, S. and Gerhardt, I. and Jetter, M. and Portalupi, S. L. and Michler, P.}, doi = {10.1103/PhysRevB.103.195304}, journal = {Phys. Rev. B}, month = {05}, number = 19, numpages = {7}, pages = 195304, publisher = {American Physical Society}, title = {Delaying two-photon Fock states in hot cesium vapor using single photons generated on demand from a semiconductor quantum dot}, url = {https://link.aps.org/doi/10.1103/PhysRevB.103.195304}, volume = 103, year = 2021 }
  Link
  https://link.aps.org/doi/10.1103/PhysRevB.103.195304
2020
1. Hepp, S., Hornung, F., Bauer, S., Hesselmeier, E., Yuan, X., Jetter, M., Portalupi, S. L., Rastelli, A., & Michler, P. (2020). Purcell-enhanced single-photon emission from a strain-tunable quantum dot in a cavity-waveguide device. Appl. Phys. Lett., 117(25), Article 25. https://doi.org/10.1063/5.0033213
  - BibTeX
  - Link
  BibTeX
  @article{hepp2020purcellenhanced, abstract = {On-chip quantum photonics is a promising route toward the implementation of complex photonic architectures on a small footprint. Therefore, different photonic components demonstrated for off-chip o...}, author = {Hepp, Stefan and Hornung, Florian and Bauer, Stephanie and Hesselmeier, Erik and Yuan, Xueyong and Jetter, Michael and Portalupi, Simone L. and Rastelli, Armando and Michler, Peter}, booktitle = {Applied Physics Letters}, comment = {doi: 10.1063/5.0033213}, doi = {10.1063/5.0033213}, issn = {00036951}, journal = {Appl. Phys. Lett.}, month = {12}, number = 25, pages = {254002--}, privnote = {doi: 10.1063/5.0033213}, publisher = {American Institute of Physics}, title = {Purcell-enhanced single-photon emission from a strain-tunable quantum dot in a cavity-waveguide device}, url = {https://doi.org/10.1063/5.0033213}, volume = 117, year = 2020 }
  Link
  https://doi.org/10.1063/5.0033213
2. Hoppe, N., Zaoui, W. S., Rathgeber, L., Wang, Y., Klenk, R. H., Vogel, W., Kaschel, M., Portalupi, S. L., Burghartz, J., & Berroth, M. (2020). Ultra-Efficient Silicon-on-Insulator Grating Couplers With Backside Metal Mirrors. IEEE Journal of Selected Topics in Quantum Electronics, 26(2), Article 2. https://doi.org/10.1109/JSTQE.2019.2935296
  - BibTeX
  - Link
  BibTeX
  @article{8798714, abstract = {Coupling of light from off-chip into highly complex silicon-based devices is currently focus of efforts and research. In this work, the experimental demonstration of a -0.50 dB (89%) coupling efficiency in the C-band with the help of an aperiodic grating coupler design in a 250 nm silicon-on-insulator (SOI) technology is shown. Further, this work reports about the latest results regarding focusing grating couplers with footprints of only 30 μm × 30 μm and a measured coupling efficiency of up to -0.93 dB (81%) at 1549 nm. Efficient grating coupler arrays are realized by using an expanded backside metal mirror-strip for the application of fiber arrays. In addition, this work presents aperiodic silicon grating couplers with an enhanced bandwidth to overcome the limited usability of grating couplers in wavelength division multiplexing (WDM) systems.}, author = {Hoppe, N. and Zaoui, W. S. and Rathgeber, L. and Wang, Y. and Klenk, R. H. and Vogel, W. and Kaschel, M. and Portalupi, S. L. and Burghartz, J. and Berroth, M.}, doi = {10.1109/JSTQE.2019.2935296}, issn = {1558-4542}, journal = {IEEE Journal of Selected Topics in Quantum Electronics}, month = {03}, number = 2, pages = {1-6}, title = {Ultra-Efficient Silicon-on-Insulator Grating Couplers With Backside Metal Mirrors}, url = {https://ieeexplore.ieee.org/document/8798714}, volume = 26, year = 2020 }
  Link
  https://ieeexplore.ieee.org/document/8798714
3. Vural, H., Maisch, J., Gerhardt, I., Jetter, M., Portalupi, S. L., & Michler, P. (2020). Characterization of spectral diffusion by slow-light photon-correlation spectroscopy. Phys. Rev. B, 101(16), Article 16. https://doi.org/10.1103/PhysRevB.101.161401
  - BibTeX
  - Link
  BibTeX
  @article{PhysRevB.101.161401, author = {Vural, H. and Maisch, J. and Gerhardt, I. and Jetter, M. and Portalupi, S. L. and Michler, P.}, doi = {10.1103/PhysRevB.101.161401}, journal = {Phys. Rev. B}, month = {04}, number = 16, numpages = {6}, pages = 161401, publisher = {American Physical Society}, title = {Characterization of spectral diffusion by slow-light photon-correlation spectroscopy}, url = {https://link.aps.org/doi/10.1103/PhysRevB.101.161401}, volume = 101, year = 2020 }
  Link
  https://link.aps.org/doi/10.1103/PhysRevB.101.161401
4. Maisch, J., Vural, H., Jetter, M., Gerhardt, I., Portalupi, S., & Michler, P. (2020). Controllable Delay and Polarization Routing of Single Photons. Advaced Quatum Technologies. https://doi.org/201900057
  - BibTeX
  - Link
  BibTeX
  @article{noauthororeditor, abstract = {Full control of single photons is important in quantum information and quantum networking. In particular, controlling the photon–atom interaction can be an appealing means to realize more complex quantum experiments. As a matter of example, the storage of photons into atomic media represents one key approach to memory‐assisted quantum communication and computing. Here it is shown that the propagation of single photons from a semiconductor quantum dot can be deliberately controlled by an atomic vapor under the application of an external magnetic field. The present results enable the use of an atomic vapor as a precise and reliable wavelength selective delay and allows for routing the single photons according to their polarization and the external magnetic field. With an overall delay of 25 ns, it is possible to fine‐tune the arrival time of the photons by more than 600 ps which matches the scale of the quantum dot's lifetime. The experimental data are fully reproduced by a theoretical model.}, author = {Maisch, Julian and Vural, Hüseyin and Jetter, Michael and Gerhardt, Ilja and Portalupi, Simone and Michler, Peter}, doi = {201900057}, journal = {Advaced Quatum Technologies}, language = {english}, title = {Controllable Delay and Polarization Routing of Single Photons}, url = {https://doi.org/10.1002/qute.201900057}, year = 2020 }
  Link
  https://doi.org/10.1002/qute.201900057
5. Bremer, L., Weber, K., Fischbach, S., Thiele, S., Schmidt, M., Kaganskiy, A., Rodt, S., Herkommer, A., Sartison, M., Portalupi, S. L., Michler, P., Giessen, H., & Reitzenstein, S. (2020). Quantum dot single-photon emission coupled into single-mode fibers with 3D printed micro-objectives. APL Photonics, 5(10), Article 10. https://doi.org/10.1063/5.0014921
  - BibTeX
  - Link
  BibTeX
  @article{bremer2020quantum, abstract = {User-friendly single-photon sources with high photon-extraction efficiency are crucial building blocks for photonic quantum applications. For many of these applications, such as long-distance quant...}, author = {Bremer, Lucas and Weber, Ksenia and Fischbach, Sarah and Thiele, Simon and Schmidt, Marco and Kaganskiy, Arsenty and Rodt, Sven and Herkommer, Alois and Sartison, Marc and Portalupi, Simone Luca and Michler, Peter and Giessen, Harald and Reitzenstein, Stephan}, booktitle = {APL Photonics}, comment = {doi: 10.1063/5.0014921}, doi = {10.1063/5.0014921}, journal = {APL Photonics}, month = {10}, number = 10, pages = {106101--}, privnote = {doi: 10.1063/5.0014921}, publisher = {American Institute of Physics}, title = {Quantum dot single-photon emission coupled into single-mode fibers with 3D printed micro-objectives}, url = {https://doi.org/10.1063/5.0014921}, volume = 5, year = 2020 }
  Link
  https://doi.org/10.1063/5.0014921
6. Herzog, T., Böhrkircher, S., Both, S., Fischer, M., Sittig, R., Jetter, M., Portalupi, S. L., Weiss, T., & Michler, P. (2020). Realization of a tunable fiber-based double cavity system. Phys. Rev. B, 102(23), Article 23. https://doi.org/10.1103/PhysRevB.102.235306
  - BibTeX
  - Link
  BibTeX
  @article{PhysRevB.102.235306, author = {Herzog, T. and Böhrkircher, S. and Both, S. and Fischer, M. and Sittig, R. and Jetter, M. and Portalupi, S. L. and Weiss, T. and Michler, P.}, doi = {10.1103/PhysRevB.102.235306}, journal = {Phys. Rev. B}, month = {12}, number = 23, numpages = {6}, pages = 235306, publisher = {American Physical Society}, title = {Realization of a tunable fiber-based double cavity system}, url = {https://link.aps.org/doi/10.1103/PhysRevB.102.235306}, volume = 102, year = 2020 }
  Link
  https://link.aps.org/doi/10.1103/PhysRevB.102.235306
7. Vural, H., Portalupi, S., & Michler, P. (2020). Perspective of self-assembled InGaAs quantum-dots for multi-source quantum implementations. Applied Physics Letters, 117(3), Article 3. https://doi.org/10.1063/5.0010782
  - BibTeX
  - Link
  BibTeX
  @article{noauthororeditor, abstract = {In recent years, semiconductor quantum dots have demonstrated their potential to reach the goal of being an ideal source of single and entangled photon pairs. Exciting reports of near unity entanglement fidelity, close to unity photon indistinguishability, and high collection efficiency in nanophotonic structures have been demonstrated by several distinct groups, showing unequivocally the maturity of this technology. To achieve the required complexity and scalability in realistic quantum photonic implementations, two-photon interference of photons from multi-sources must be reached. While high indistinguishability values have been observed for photons generated from the same source within a relatively short time separation, achieving similar visibility for larger time separation or in multi-source experiments still requires intensive efforts. In fact, the coupling to the particular mesoscopic environment of charge carriers confined in the quantum dot leads to decoherence processes, which limit the quantum interference effects to a short time window. Here, we discuss the progress in studying the dynamics of this decoherence, which crucially depends on the evolution of line broadening in high-quality self-assembled InGaAs quantum dots. Characterization of line broadening mechanisms is the first fundamental step to be able to counteract them. Optimization of the growth and active and passive control of the radiative transitions are crucial for the technological readiness of non-classical light sources based on semiconductor platforms. The non-classical emission properties of self-assembled semiconductor quantum dots (QDs), which render them one of the most appealing platforms for quantum photonics, were already demonstrated at the beginning of the millennium: the emission of triggered single photons1 and the indistinguishability of successively emitted photons.2 These two properties provide the basis for many quantum optical technologies,3–9 while utilizing resonant π‐ pulse excitation is a promising scheme to push QD emission to its best performance. High-performance deterministic sources10–12 can bring significant advantages to the realization of quantum information tasks in comparison to the utilization of probabilistic emitters.13 To shed light on the limitations these emitters still face, it is instructive to have a look at the milestone works on the path to ever better non-classical interference visibilities of QD photons. The first observation of Hong–Ou–Mandel (HOM) two-photon interference14 of successively emitted QD photons was reached under the resonant excitation of higher QD states2 and demonstrated a visibility of 0.8. However, this high degree of indistinguishability could not be justified by the measured coherence time of the photons by means of Fourier spectroscopy (FS). This suggested that emission line broadening mainly occurs at a much slower rate than the radiative decay. While the pure dephasing on the photons' wavepacket15 tends to vanish, a diffusion of emission frequency is present, which is below the spectral resolution of standard spectrometers, and its temporal dynamics cannot be resolved by standard FS.16,17 A continuous improvement in the non-classical properties of semiconductor quantum dots and their efficient integration in nanophotonic devices were achieved over the years.10,11,18 Following the first demonstration of non-classical interference for successively emitted QD photons, it took a decade to observe close to unity HOM interference visibility. This was reached by the combination of a high-quality sample and a proper pumping scheme: resonant excitation into the s-shell under the π‐ pulse.19 However, the emission spectrum still showed line broadening with a strong dependence on the excitation power in the investigated range of up to the π‐ pulse. In contrast, negligible reduction of HOM visibility with the pulse power implied that the fluctuation amplitude of the slower line broadening mechanism is indeed independent of the intrinsic photonic coherence. The next significant step was the demonstration of indistinguishable photons from a resonantly pumped QD embedded in a micropillar structure.20,21 In these devices, near unity visibility was shown not only for a time separation between successively emitted photons of a few nanoseconds but also for photons hundreds of nanoseconds22 or up to 15 μs (Ref. 23) apart. The additional high brightness of such a source allowed very recently demultiplexed multi-photon boson sampling, approaching the performance of classical computers.9 Further improvements in quantum optical applications and their scalability crucially depend on the understanding and control of the broadening processes, which limit HOM visibility and thus the quantum interference and fidelity of many applications. For a single emitter, the dynamics of these decoherence processes translates in the time-wise reduction of HOM visibility, which limits the achievable photon number in multi-photon applications. For independent multi-source applications, the full integrated spectra due to the total extent of broadening processes directly determine their quantum interference. Despite its determining character and crucial importance for the future technological readiness, the decoherence dynamics of single-photon emitters translating into the emission spectrum are rarely studied. Further below, after a short overview on the noise sources, we discuss the approaches to study the broadening dynamics and attempts dedicated to their stabilization (Fig. 1). figure FIG. 1. (a)–(c) Illustration of an electron-hole pair confined in a self-assembled quantum dot (QD) under environmental coupling of (a) lattice vibrations, (b) nuclear spins constituting an effective magnetic field Beff referred to as the Overhauser-field, and (c) local charges. Their fluctuations induce dephasing and emission line broadening over the indicated timescales. Δνi/ΔνFL is the ratio between common environment-induced broadening and the Fourier-limited homogeneous linewidth. (d)–(f) Illustration of active and passive counteracting approaches including (d) a quantum dot in a microcavity at cryogenic temperature, (e) an external magnetic field Bext and self-locking effects through dynamic nuclear spin polarization (DNSP), and (f) an external electric field Eext and active feedback control.}, author = {Vural, Hüseyin and Portalupi, Simone and Michler, Peter}, doi = {https://doi.org/10.1063/5.0010782}, journal = {Applied Physics Letters}, language = {engl}, number = 3, title = {Perspective of self-assembled InGaAs quantum-dots for multi-source quantum implementations}, url = {https://aip.scitation.org/doi/full/10.1063/5.0010782?journalCode=apl}, volume = 117, year = 2020 }
  Link
  https://aip.scitation.org/doi/full/10.1063/5.0010782?journalCode=apl
8. Yang, J., Nawrath, C., Keil, R., Joos, R., Zhang, X., Höfer, B., Chen, Y., Zopf, M., Jetter, M., Portalupi, S. L., Ding, F., Michler, P., & Schmidt, O. G. (2020). Quantum dot-based broadband optical antenna for efficient extraction of single photons in the telecom O-band. Opt. Express, 28(13), Article 13. https://doi.org/10.1364/OE.395367
  - BibTeX
  - Link
  BibTeX
  @article{Yang:20, abstract = {Long-distance fiber-based quantum communication relies on efficient non-classical light sources operating at telecommunication wavelengths. Semiconductor quantum dots are promising candidates for on-demand generation of single photons and entangled photon pairs for such applications. However, their brightness is strongly limited due to total internal reflection at the semiconductor/vacuum interface. Here we overcome this limitation using a dielectric antenna structure. The non-classical light source consists of a gallium phosphide solid immersion lens in combination with a quantum dot nanomembrane emitting single photons in the telecom O-band. With this device, the photon extraction is strongly increased in a broad spectral range. A brightness of 17\% (numerical aperture of 0.6) is obtained experimentally, with a single photon purity of g(2)(0)$=$0.049{\textpm}0.02 at saturation power. This brings the practical implementation of quantum communication networks one step closer.}, author = {Yang, Jingzhong and Nawrath, Cornelius and Keil, Robert and Joos, Raphael and Zhang, Xi and H\"{o}fer, Bianca and Chen, Yan and Zopf, Michael and Jetter, Michael and Portalupi, Simone Luca and Ding, Fei and Michler, Peter and Schmidt, Oliver G.}, doi = {10.1364/OE.395367}, journal = {Opt. Express}, month = {06}, number = 13, pages = {19457--19468}, publisher = {OSA}, title = {Quantum dot-based broadband optical antenna for efficient extraction of single photons in the telecom O-band}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-28-13-19457}, volume = 28, year = 2020 }
  Link
  http://www.opticsexpress.org/abstract.cfm?URI=oe-28-13-19457
2019
1. Hepp, S., Jetter, M., Portalupi, S., & Michler, P. (2019). Semiconductor Quantum Dots for Integrated Quantum Photonics. Advanced Quantum Technologies. https://doi.org/10.1002/qute.201900020
  - BibTeX
  BibTeX
  @article{noauthororeditor, abstract = {Quantum mechanics promises to have a strong impact on many aspects of research and technology, improving classical analogues via purely quantum effects. A large variety of tasks are currently under investigation, for example, the implementation of quantum computing, sensing, metrology, and communication. From a general perspective, in a similar way as classical computing benefited by the reduction of the device footprint, enabling the realization of highly complex chips, a range of quantum applications will sensibly improve thanks to the successful realization of on‐chip quantum photonics. Conversely to bulky table‐top experiments, it would be very advantageous to transfer all required functionalities on the same quantum photonic chip. The key elements for quantum photonic circuits are on‐demand nonclassical light sources, a versatile photonic logic, the ability to store quantum information, and highly efficient detectors, directly integrated on‐chip. Among several systems capable of the efficient generation of single‐ and indistinguishable photons, quantum dots are rapidly establishing as one of the most appealing candidates. This paper reviews the recent progress in the on‐chip integration of quantum‐dot‐based nonclassical light sources as well as in the development of the main building blocks, either integrated monolithically or hybridly on a compact and scalable platform.}, author = {Hepp, Sefan and Jetter, Michael and Portalupi, Simone and Michler, Peter}, doi = {10.1002/qute.201900020}, journal = {Advanced Quantum Technologies}, language = {english}, month = {07}, title = {Semiconductor Quantum Dots for Integrated Quantum Photonics}, year = 2019 }
2. Nawrath, C., Olbrich, F., Paul, M., Portalupi, S. L., Jetter, M., & Michler, P. (2019). Coherence and indistinguishability of highly pure single photons from non-resonantly and resonantly excited telecom C-band quantum dots. Appl. Phys. Lett., 115(2), Article 2. https://doi.org/10.1063/1.5095196
  - BibTeX
  - Link
  BibTeX
  @article{nawrath2019coherence, abstract = {The role of resonant pumping schemes in improving the photon coherence is investigated on InAs/InGaAs/GaAs quantum dots (QDs) emitted in the telecom C-band. The linewidths of transitions of multipl...}, author = {Nawrath, C and Olbrich, F and Paul, M and Portalupi, S. L. and Jetter, M and Michler, P}, booktitle = {Applied Physics Letters}, comment = {doi: 10.1063/1.5095196}, doi = {10.1063/1.5095196}, issn = {00036951}, journal = {Appl. Phys. Lett.}, month = {07}, number = 2, pages = {023103--}, privnote = {doi: 10.1063/1.5095196}, publisher = {American Institute of Physics}, title = {Coherence and indistinguishability of highly pure single photons from non-resonantly and resonantly excited telecom C-band quantum dots}, url = {https://doi.org/10.1063/1.5095196}, volume = 115, year = 2019 }
  Link
  https://doi.org/10.1063/1.5095196
3. Reindl, M., Weber, J. H., Huber, D., Schimpf, C., Covre da Silva, S. F., Portalupi, S. L., Trotta, R., Michler, P., & Rastelli, A. (2019). Highly indistinguishable single photons from incoherently excited quantum dots. Phys. Rev. B, 100(15), Article 15. https://doi.org/10.1103/PhysRevB.100.155420
  - BibTeX
  - Link
  BibTeX
  @article{PhysRevB.100.155420, author = {Reindl, Marcus and Weber, Jonas H. and Huber, Daniel and Schimpf, Christian and Covre da Silva, Saimon F. and Portalupi, Simone L. and Trotta, Rinaldo and Michler, Peter and Rastelli, Armando}, doi = {10.1103/PhysRevB.100.155420}, journal = {Phys. Rev. B}, month = {10}, number = 15, numpages = {8}, pages = 155420, publisher = {American Physical Society}, title = {Highly indistinguishable single photons from incoherently excited quantum dots}, url = {https://link.aps.org/doi/10.1103/PhysRevB.100.155420}, volume = 100, year = 2019 }
  Link
  https://link.aps.org/doi/10.1103/PhysRevB.100.155420
4. Poertalupi, S. L., Jetter, M., & Michler, P. (2019). InAs quantum dots grown on metamorphic buffers as non-classical light sources at telecom C-band: a review. Semicond. Sci. Technol. 34, 053001.
  - BibTeX
  BibTeX
  @book{poertalupi2019quantum, author = {Poertalupi, S.L. and Jetter, M and Michler, P}, publisher = {Semicond. Sci. Technol. 34, 053001 }, title = {InAs quantum dots grown on metamorphic buffers as non-classical light sources at telecom C-band: a review}, year = 2019 }
5. Weber, J. H., Kambs, B., Kettler, J., Kern, S., Maisch, J., Vural, H., Jetter, M., Portalupi, S. L., Becher, C., & Michler, P. (2019). Two-photon interference in the telecom C-band after frequency conversion of photons from remote quantum emitters. Nature Nanotechnology, 14, 23–26. https://doi.org/10.1038/s41565-018-0279-8
  - BibTeX
  - Link
  BibTeX
  @article{weber2019twophoton, abstract = {Efficient fibre-based long-distance quantum communication via quantum repeaters relies on deterministic single-photon sources at telecom wavelengths, potentially exploiting the existing world-wide infrastructures. For upscaling the experimental complexity in quantum networking, two-photon interference (TPI) of remote non-classical emitters in the low-loss telecom bands is of utmost importance. Several experiments have been conducted regarding TPI of distinct emitters, for example, using trapped atoms1, ions2, nitrogen vacancy centres3,4, silicon vacancy centres5, organic molecules6 and semiconductor quantum dots7,8. However, the spectral range was far from the highly desirable telecom C-band. Here, we exploit quantum frequency conversion to realize TPI at 1,550 nm with single photons stemming from two remote quantum dots. We thereby prove quantum frequency conversion9–11 as a bridging technology and a precise and stable mechanism to erase the frequency difference between independent emitters. On resonance, a TPI visibility of 29 ± 3% has been observed, limited only by the spectral diffusion processes of the individual quantum dots12,13. The local fibre network used covers several rooms between two floors of the building. Even the addition of up to 2 km of fibre channel shows no influence on the TPI visibility, proving the photon wavepacket distortion to be negligible. Our studies pave the way to establish long-distance entanglement distribution between remote solid-state emitters including interfaces with various quantum hybrid systems14–16.}, author = {Weber, Jonas H. and Kambs, Benjamin and Kettler, Jan and Kern, Simon and Maisch, Julian and Vural, Hüseyin and Jetter, Michael and Portalupi, Simone L. and Becher, Christoph and Michler, Peter}, doi = {10.1038/s41565-018-0279-8}, issn = {17483395}, journal = {Nature Nanotechnology}, pages = {23-26}, refid = {Weber2018}, title = {Two-photon interference in the telecom C-band after frequency conversion of photons from remote quantum emitters}, url = {https://doi.org/10.1038/s41565-018-0279-8}, volume = 14, year = 2019 }
  Link
  https://doi.org/10.1038/s41565-018-0279-8
6. Höfer, B., Olbrich, F., Kettler, J., Paul, M., Höschele, J., Jetter, M., Portalupi, S. L., Ding, F., Michler, P., & Schmidt, O. G. (2019). Tuning emission energy and fine structure splitting in quantum dots emitting in the telecom O-band. AIP Advances, 9(8), Article 8. https://doi.org/10.1063/1.5110865
  - BibTeX
  - Link
  BibTeX
  @article{hofer2019tuning, abstract = {We report on optical investigations of MOVPE-grown InGaAs/GaAs quantum dots emitting at the telecom O-band that were integrated onto uniaxial piezoelectric actuators. This promising technique, whic...}, author = {Höfer, B and Olbrich, F and Kettler, J and Paul, M and Höschele, J and Jetter, M and Portalupi, S. L. and Ding, F and Michler, P and Schmidt, O. G.}, booktitle = {AIP Advances}, comment = {doi: 10.1063/1.5110865}, doi = {10.1063/1.5110865}, journal = {AIP Advances}, month = {08}, number = 8, pages = {085112--}, privnote = {doi: 10.1063/1.5110865}, publisher = {American Institute of Physics}, title = {Tuning emission energy and fine structure splitting in quantum dots emitting in the telecom O-band}, url = {https://doi.org/10.1063/1.5110865}, volume = 9, year = 2019 }
  Link
  https://doi.org/10.1063/1.5110865
7. Sartison, M., Seyfferle, S., Kolatschek, S., Hepp, S., Jetter, M., Michler, P., & Portalupi, S. L. (2019). Single-photon light-emitting diodes based on preselected quantum dots using a deterministic lithography technique. Appl. Phys. Lett., 114(22), Article 22. https://doi.org/10.1063/1.5091751
  - BibTeX
  - Link
  BibTeX
  @article{sartison2019singlephoton, abstract = {In the present study, we developed a deterministic fabrication process for an electrically driven single-photon light-emitting diode based on InP quantum dots (QDs) emitting in the red spectral ran...}, author = {Sartison, Marc and Seyfferle, Simon and Kolatschek, Sascha and Hepp, Stefan and Jetter, Michael and Michler, Peter and Portalupi, Simone Luca}, booktitle = {Applied Physics Letters}, comment = {doi: 10.1063/1.5091751}, doi = {10.1063/1.5091751}, issn = {00036951}, journal = {Appl. Phys. Lett.}, month = {06}, number = 22, pages = {222101--}, privnote = {doi: 10.1063/1.5091751}, publisher = {American Institute of Physics}, title = {Single-photon light-emitting diodes based on preselected quantum dots using a deterministic lithography technique}, url = {https://doi.org/10.1063/1.5091751}, volume = 114, year = 2019 }
  Link
  https://doi.org/10.1063/1.5091751
8. Kolatschek, S., Hepp, S., Sartison, M., Jetter, M., Michler, P., & Portalupi, S. L. (2019). Deterministic fabrication of circular Bragg gratings coupled to single quantum emitters via the combination of in-situ optical lithography and electron-beam lithography. Journal of Applied Physics, 125(4), Article 4. https://doi.org/10.1063/1.5050344
  - BibTeX
  - Link
  BibTeX
  @article{kolatschek2019deterministic, abstract = {In the present work, we investigate the coupling of deterministically pre-selected In(Ga)As/GaAs quantum dots (QDs) to low Q circular Bragg grating cavities by employing a combination of state-of-the-art low-temperature in-situ optical lithography and electron-beam lithography. The spatial overlap between the cavity mode and quantum emitter is ensured through the accurate determination of the QD position via precise interferometric position readout. Simultaneously, the high precision of the electron-beam lithography is exploited for the cavity fabrication. In order to optimize the spectral overlap, prior to cavity fabrication, finite-difference time-domain simulations are performed to estimate the spectral position of the cavity mode. A Purcell factor of 2 together with an increased count rate is reported for a deterministically positioned cavity where the emission line is detuned by 3.9 nm with respect to the cavity mode. This non-negligible Purcell enhancement for large detunings and, thus, the large ra...}, author = {Kolatschek, S and Hepp, S and Sartison, M and Jetter, M and Michler, P and Portalupi, S. L.}, booktitle = {Journal of Applied Physics}, comment = {doi: 10.1063/1.5050344}, doi = {10.1063/1.5050344}, issn = {00218979}, journal = {Journal of Applied Physics}, month = {01}, number = 4, pages = {045701--}, privnote = {doi: 10.1063/1.5050344}, publisher = {American Institute of Physics}, title = {Deterministic fabrication of circular Bragg gratings coupled to single quantum emitters via the combination of in-situ optical lithography and electron-beam lithography}, url = {https://doi.org/10.1063/1.5050344}, volume = 125, year = 2019 }
  Link
  https://doi.org/10.1063/1.5050344
9. Portalupi, S., Jetter, M., & Michler, P. (2019). InAs quantum dots grown on metamorphic buffers as non-classical light sources at telecom C-band: a review. Semiconductor Science and Technology, 34(5), Article 5. https://iopscience.iop.org/article/10.1088/1361-6641/ab08b4
  - BibTeX
  - Link
  BibTeX
  @article{noauthororeditor, author = {Portalupi, Simone and Jetter, Michael and Michler, Peter}, journal = { Semiconductor Science and Technology}, language = {english}, number = 5, title = {InAs quantum dots grown on metamorphic buffers as non-classical light sources at telecom C-band: a review}, url = {https://iopscience.iop.org/article/10.1088/1361-6641/ab08b4}, volume = 34, year = 2019 }
  Link
  https://iopscience.iop.org/article/10.1088/1361-6641/ab08b4
2018
1. Schwartz, M., Schmidt, E., Rengstl, U., Hornung, F., Hepp, S., Portalupi, S. L., llin, K., Jetter, M., Siegel, M., & Michler, P. (2018). Fully On-Chip Single-Photon Hanbury-Brown and Twiss Experiment on a Monolithic Semiconductor–Superconductor Platform.
  - BibTeX
  BibTeX
  @article{noauthororeditor, author = {Schwartz, Mario and Schmidt, Ekkehart and Rengstl, Ulrich and Hornung, Florian and Hepp, Stefan and Portalupi, Simone L. and llin, Konstantin and Jetter, Michael and Siegel, Michael and Michler, Peter}, title = {Fully On-Chip Single-Photon Hanbury-Brown and Twiss Experiment on a Monolithic Semiconductor–Superconductor Platform}, year = 2018 }
2. Vural, H., Portalupi, S. L., Maisch, J., Kern, S., Weber, J. H., Jetter, M., Wrachtrup, J., Löw, R., Gerhardt, I., & Michler, P. (2018). Two-photon interference in an atom-quantum dot hybrid system. Optica, 5(4), Article 4. https://doi.org/10.1364/OPTICA.5.000367
  - BibTeX
  - Link
  BibTeX
  @article{Vural:18, abstract = {Future quantum networks will need flying qubits and stationary nodes. As for the generation of single photons which may act as flying qubits, resonantly excited single-semiconductor quantum dots are ideal in terms of their on-demand single-photon emission, indistinguishability, and brightness. Atomic systems can effectively act as mediators for photons; photon interactions, storage media, or building blocks for stationary qubits. Here, we hybridize these two systems and investigate the non-classical interference of spectral Lorentzian-shaped photons, fine-tuned between the cesium (Cs)-D1 hyperfine resonances. The temporal delay in the dispersive hot atomic cesium vapor amounts up to 50 times the photons; initial width and reveals beats on the single quanta. The photons; indistinguishability is preserved even after atomic-enabled delay. This proves that the interaction with the Cs vapor conserves the photons; coherence. The role of spectral diffusion in the solid-state emitter is studied in single- and two-photon experiments in light of the strong frequency dependence of the atomic medium. Our results pave the way for efficient hybrid interfaces between quantum dots and hot atomic vapors as storage media in future quantum networks.}, author = {Vural, Hüseyin and Portalupi, Simone L. and Maisch, Julian and Kern, Simon and Weber, Jonas H. and Jetter, Michael and Wrachtrup, Jörg and Löw, Robert and Gerhardt, Ilja and Michler, Peter}, doi = {10.1364/OPTICA.5.000367}, journal = {Optica}, month = {04}, number = 4, pages = {367--373}, publisher = {OSA}, title = {Two-photon interference in an atom-quantum dot hybrid system}, url = {http://www.osapublishing.org/optica/abstract.cfm?URI=optica-5-4-367}, volume = 5, year = 2018 }
  Link
  http://www.osapublishing.org/optica/abstract.cfm?URI=optica-5-4-367
3. Höfer, B., Olbrich, F., Kettler, J., Paul, M., Höschele, J., Jetter, M., Portalupi, S. L., Ding, F., Michler, P., & Schmidt, O. G. (2018). Tuning emission energy and fine structure splitting in quantum dots emitting in the telecom O-band.
  - BibTeX
  BibTeX
  @article{noauthororeditor, author = {Höfer, Bianca and Olbrich, Fabian and Kettler, Jan and Paul, Matthias and Höschele, Jonathan and Jetter, Michael and Portalupi, Simone L. and Ding, Fei and Michler, Peter and Schmidt, Oliver G.}, title = {Tuning emission energy and fine structure splitting in quantum dots emitting in the telecom O-band}, year = 2018 }
4. Sartison, M., Engel, L., Kolatschek, S., Olbrich, F., Nawrath, C., Hepp, S., Jetter, M., Michler, P., & Portalupi, S. L. (2018). Deterministic integration and optical characterization of telecom O-band quantum dots embedded into wet-chemically etched Gaussian-shaped microlenses. Appl. Phys. Lett., 113(3), Article 3. https://doi.org/10.1063/1.5038271
  - BibTeX
  - Link
  BibTeX
  @article{sartison2018deterministic, abstract = {In the present study, we report on the deterministic integration of quantum dots, emitting in the telecom O-band, into wet-chemically fabricated Gaussian-shaped microlenses which exhibit a surface quality comparable to epi-ready wafers. The slow wet-chemical etching rate enables us to gain control of the lens aspect-ratio and the vertical position with respect to the quantum dot, allowing us to engineer the far field shape to better match the acceptance profile of single-mode fibers. Maximum light enhancement values of around 10 to 16 could be achieved for collection numerical apertures from 0.6 to 0.2, respectively. The current results constitute an important step forward in transferring state-of-the-art performances achieved in the near-infrared regime to the key wavelengths for long distance fiber communication.}, author = {Sartison, Marc and Engel, Lena and Kolatschek, Sascha and Olbrich, Fabian and Nawrath, Cornelius and Hepp, Stefan and Jetter, Michael and Michler, Peter and Portalupi, Simone Luca}, booktitle = {Applied Physics Letters}, comment = {doi: 10.1063/1.5038271}, doi = {10.1063/1.5038271}, issn = {00036951}, journal = {Appl. Phys. Lett.}, month = {07}, number = 3, pages = {032103--}, privnote = {doi: 10.1063/1.5038271}, publisher = {American Institute of Physics}, title = {Deterministic integration and optical characterization of telecom O-band quantum dots embedded into wet-chemically etched Gaussian-shaped microlenses}, url = {https://doi.org/10.1063/1.5038271}, volume = 113, year = 2018 }
  Link
  https://doi.org/10.1063/1.5038271
5. Weber, J. H., Kettler, J., Vural, H., Müller, M., Maisch, J., Jetter, M., Portalupi, S. L., & Michler, P. (2018). Overcoming correlation fluctuations in two-photon interference experiments with differently bright and independently blinking remote quantum emitters. Phys. Rev. B, 97(19), Article 19. https://doi.org/10.1103/PhysRevB.97.195414
  - BibTeX
  - Link
  BibTeX
  @article{PhysRevB.97.195414, author = {Weber, Jonas H. and Kettler, Jan and Vural, H\"useyin and M\"uller, Markus and Maisch, Julian and Jetter, Michael and Portalupi, Simone L. and Michler, Peter}, doi = {10.1103/PhysRevB.97.195414}, journal = {Phys. Rev. B}, month = {05}, number = 19, numpages = {6}, pages = 195414, publisher = {American Physical Society}, title = {Overcoming correlation fluctuations in two-photon interference experiments with differently bright and independently blinking remote quantum emitters}, url = {https://link.aps.org/doi/10.1103/PhysRevB.97.195414}, volume = 97, year = 2018 }
  Link
  https://link.aps.org/doi/10.1103/PhysRevB.97.195414
6. Hepp, S., Bauer, S., Hornung, F., Schwartz, M., Portalupi, S. L., Jetter, M., & Michler, P. (2018). Bragg grating cavities embedded into nano-photonic waveguides for Purcell enhanced quantum dot emission. Opt. Express, 26(23), Article 23. https://doi.org/10.1364/OE.26.030614
  - BibTeX
  - Link
  BibTeX
  @article{Hepp:18, abstract = {In the present work, we demonstrate the fabrication and optical properties of Bragg grating cavities that are directly integrated into ridge waveguides along with the Purcell enhanced emission from integrated quantum dots. Measured Q-factors up to 4600 are observed in combination with resonances of the fundamental mode within a \&\#x000B1; 0.11 nm range along the full fabricated chip. The measured Purcell enhancement up to a factor of 3.5 \&\#x000B1; 0.5 shows the potential utility for state-of-the-art on-chip quantum optical experiments as realized in off-chip implementations. Our measurements are fully supported via FDTD simulations giving a theoretical Purcell enhancement up to a factor of 20 with a highly directional \&\#x003B2;dir-factor of 70 \&\#x00025;. The straightforward upscaling and robust design of the investigated Bragg grating cavity in combination with a substantial Purcell enhancement represents a major step towards large scale on-chip quantum photonic circuits.}, author = {Hepp, Stefan and Bauer, Stephanie and Hornung, Florian and Schwartz, Mario and Portalupi, Simone L. and Jetter, Michael and Michler, Peter}, doi = {10.1364/OE.26.030614}, journal = {Opt. Express}, month = {11}, number = 23, pages = {30614--30622}, publisher = {OSA}, title = {Bragg grating cavities embedded into nano-photonic waveguides for Purcell enhanced quantum dot emission}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-26-23-30614}, volume = 26, year = 2018 }
  Link
  http://www.opticsexpress.org/abstract.cfm?URI=oe-26-23-30614
7. Widmann, M., Portalupi, S. L., Michler, P., Wrachtrup, J., & Gerhardt, I. (2018). Faraday Filtering on the Cs-D1-Line for Quantum Hybrid Systems. IEEE Photonics Technology Letters, 30(24), Article 24. https://doi.org/10.1109/LPT.2018.2871770
  - BibTeX
  - Link
  BibTeX
  @article{8470115, abstract = {Narrow-band filtering of light is widely used in optical spectroscopy. Atomic filters, which rely on the Faraday effect, allow for GHz-wide transmission spectra, which are intrinsically matched to an atomic transition. We present an experimental realization and a theoretical study of a Faraday filter based on cesium and its D<sub>1</sub>-line-transition (<inline-formula><tex-math notation="LaTeX">$6^{2}S_{1/2}\rightarrow 6^{2}P_{1/2}$</tex-math></inline-formula>) around 894 nm. We also present the prospects and visions for combining this filter with the single photon emission of a single quantum dot, which matches with the atomic transition. The option to lock the spectral position of a quantum dot is discussed at the end of this letter.}, author = {Widmann, M. and Portalupi, S. L. and Michler, P. and Wrachtrup, J. and Gerhardt, I.}, doi = {10.1109/LPT.2018.2871770}, issn = {1041-1135}, journal = {IEEE Photonics Technology Letters}, month = {12}, number = 24, pages = {2083-2086}, title = {Faraday Filtering on the Cs-D1-Line for Quantum Hybrid Systems}, url = {https://ieeexplore.ieee.org/document/8470115/}, volume = 30, year = 2018 }
  Link
  https://ieeexplore.ieee.org/document/8470115/
8. Carmesin, C., Olbrich, F., Mehrtens, T., Florian, M., Michael, S., Schreier, S., Nawrath, C., Paul, M., Höschele, J., Gerken, B., Kettler, J., Portalupi, S. L., Jetter, M., Michler, P., Rosenauer, A., & Jahnke, F. (2018). Structural and optical properties of InAs/(In)GaAs/GaAs quantum dots with single-photon emission in the telecom C-band up to 77 K. Phys. Rev. B, 98(12), Article 12. https://doi.org/10.1103/PhysRevB.98.125407
  - BibTeX
  - Link
  BibTeX
  @article{PhysRevB.98.125407, author = {Carmesin, C. and Olbrich, F. and Mehrtens, T. and Florian, M. and Michael, S. and Schreier, S. and Nawrath, C. and Paul, M. and H\"oschele, J. and Gerken, B. and Kettler, J. and Portalupi, S. L. and Jetter, M. and Michler, P. and Rosenauer, A. and Jahnke, F.}, doi = {10.1103/PhysRevB.98.125407}, journal = {Phys. Rev. B}, month = {09}, number = 12, numpages = {9}, pages = 125407, publisher = {American Physical Society}, title = {Structural and optical properties of InAs/(In)GaAs/GaAs quantum dots with single-photon emission in the telecom C-band up to 77 K}, url = {https://link.aps.org/doi/10.1103/PhysRevB.98.125407}, volume = 98, year = 2018 }
  Link
  https://link.aps.org/doi/10.1103/PhysRevB.98.125407
9. Herzog, T., Sartison, M., Kolatschek, S., Hepp, S., Bommer, A., Pauly, C., Mücklich, F., Becher, C., Jetter, M., Portalupi, S. L., & Michler, P. (2018). Pure single-photon emission from In(Ga)As QDs in a tunable fiber-based external mirror microcavity. Quantum Science and Technology, 3(3), Article 3. https://doi.org/10.1088/2058-9565/aac64d
  - BibTeX
  - Link
  BibTeX
  @article{noauthororeditor, author = {Herzog, Thomas and Sartison, Marc and Kolatschek, Sascha and Hepp, Stefan and Bommer, Alexander and Pauly, Christoph and Mücklich, Frank and Becher, Christoph and Jetter, Michael and Portalupi, Simone Luca and Michler, Peter}, doi = {https://doi.org/10.1088/2058-9565/aac64d}, editor = {Technol, Quantum Sci.}, journal = {Quantum Science and Technology}, language = {English}, month = {06}, number = 3, title = {Pure single-photon emission from In(Ga)As QDs in a tunable fiber-based external mirror microcavity}, url = {https://doi.org/10.1088/2058-9565/aac64d}, volume = 3, year = 2018 }
  Link
  https://doi.org/10.1088/2058-9565/aac64d
2017
1. Portalupi, S., & Michler, P. (2017). Resonantly excited quantum dots: superior non-classical light sources for quantum information. In Quantum Dots for Quantum Information Technologies, Nanooptics and Nanophotonics Ed. P. Michler. Springer, Berlin, Heidelberg, 2017.
  - BibTeX
  BibTeX
  @book{noauthororeditor, author = {Portalupi, S. and Michler, P.}, booktitle = {Quantum Dots for Quantum Information Technologies, Nanooptics and Nanophotonics Ed. P. Michler}, publisher = {Springer, Berlin, Heidelberg, 2017}, title = {Resonantly excited quantum dots: superior non-classical light sources for quantum information}, year = 2017 }
2. Olbrich, F., Kettler, J., Bayerbach, M., Paul, M., Höschele, J., Portalupi, S. L., Jetter, M., & Michler, P. (2017). Temperature-dependent properties of single long-wavelength InGaAs quantum dots embedded in a strain reducing layer. Journal of Applied Physics, 121. https://doi.org/10.1063/1.4983362
  - BibTeX
  BibTeX
  @article{noauthororeditor, author = {Olbrich, Fabian and Kettler, Jan and Bayerbach, Matthias and Paul, Matthias and Höschele, Jonatan and Portalupi, Simone Luca and Jetter, Michael and Michler, Peter}, doi = {https://doi.org/10.1063/1.4983362}, journal = {Journal of Applied Physics}, title = {Temperature-dependent properties of single long-wavelength InGaAs quantum dots embedded in a strain reducing layer}, volume = 121, year = 2017 }
3. Sartison, M., Portalupi, S. L., Gissibl, T., Jetter, M., Giessen, H., & Michler, P. (2017). Combining in-situ lithography with 3D printed solid immersion lenses for single quantum dot spectroscopy. Scientific Reports, 7, 39916--. http://dx.doi.org/10.1038/srep39916
  - BibTeX
  - Link
  BibTeX
  @article{sartison2017combining, author = {Sartison, Marc and Portalupi, Simone Luca and Gissibl, Timo and Jetter, Michael and Giessen, Harald and Michler, Peter}, journal = {Scientific Reports}, month = {01}, pages = {39916--}, publisher = {The Author(s)}, title = {Combining in-situ lithography with 3D printed solid immersion lenses for single quantum dot spectroscopy}, url = {http://dx.doi.org/10.1038/srep39916}, volume = 7, year = 2017 }
  Link
  http://dx.doi.org/10.1038/srep39916
4. Paul, M., Olbrich, F., Höschele, J., Schreier, S., Kettler, J., Portalupi, S. L., Jetter, M., & Michler, P. (2017). Single-photon emission at 1.55 µm from MOVPE-grown InAs quantum dots on InGaAs/ GaAs metamorphic buffers. Applied Physics Letters, 111. https://doi.org/10.1063/1.4993935
  - BibTeX
  BibTeX
  @article{noauthororeditor, author = {Paul, Matthias and Olbrich, Fabian and Höschele, Jonatan and Schreier, Susanne and Kettler, Jan and Portalupi, Simone Luca and Jetter, Michael and Michler, Peter}, doi = {https://doi.org/10.1063/1.4993935}, journal = {Applied Physics Letters}, month = {07}, title = {Single-photon emission at 1.55 µm from MOVPE-grown InAs quantum dots on InGaAs/ GaAs metamorphic buffers}, volume = 111, year = 2017 }
5. Olbrich, F., Höschele, J., Müller, M., Kettler, J., Portalupi, S. L., Paul, M., Jetter, M., & Michler, P. (2017). Polarization-entangled photons from an InGaAs-based quantum dot emitting in the telecom C-band. Applied Physics Letters, 111. http://dx.doi.org/10.1063/1.4994145
  - BibTeX
  BibTeX
  @article{noauthororeditor, author = {Olbrich, Fabian and Höschele, Jonathan and Müller, Markus and Kettler, Jan and Portalupi, Simone Luca and Paul, Matthias and Jetter, Michael and Michler, Peter}, doi = {http://dx.doi.org/10.1063/1.4994145}, journal = {Applied Physics Letters}, month = {09}, title = {Polarization-entangled photons from an InGaAs-based quantum dot emitting in the telecom C-band}, volume = 111, year = 2017 }
2016
1. Hargart, F., Mueller, M., Roy-Choudhury, K., Portalupi, S. L., Schneider, C., Hoefling, S., Kamp, M., Hughes, S., & Michler, P. (2016). Cavity-enhanced simultaneous dressing of quantum dot exciton and biexciton states. PHYSICAL REVIEW B, 93(11), Article 11. https://doi.org/10.1103/PhysRevB.93.115308
  - BibTeX
  BibTeX
  @article{hargart2016cavityenhanced, affiliation = {Hargart, F (Reprint Author), Univ Stuttgart, Ctr Integrated Quantum Sci \& Technol IQST, Inst Halbleiteropt \& Funkt Grenzflachen, Allmandring 3, D-70569 Stuttgart, Germany. Hargart, F (Reprint Author), Univ Stuttgart, SCoPE, Allmandring 3, D-70569 Stuttgart, Germany. Roy-Choudhury, K (Reprint Author), Queens Univ, Dept Phys Engn Phys \& Astron, Kingston, ON K7L 3N6, Canada. Hargart, F.; Mueller, M.; Portalupi, S. L.; Michler, P., Univ Stuttgart, Ctr Integrated Quantum Sci \& Technol IQST, Inst Halbleiteropt \& Funkt Grenzflachen, Allmandring 3, D-70569 Stuttgart, Germany. Hargart, F.; Mueller, M.; Portalupi, S. L.; Michler, P., Univ Stuttgart, SCoPE, Allmandring 3, D-70569 Stuttgart, Germany. Roy-Choudhury, K.; Hughes, S., Queens Univ, Dept Phys Engn Phys \& Astron, Kingston, ON K7L 3N6, Canada. Schneider, C.; Hoefling, S.; Kamp, M., Univ Wurzburg, Phys Inst, Tech Phys, Hubland, D-97074 Wurzburg, Germany. Schneider, C.; Hoefling, S.; Kamp, M., Univ Wurzburg, Phys Inst, Wilhelm Conrad Rontgen Res Ctr Complex Mat Syst, Hubland, D-97074 Wurzburg, Germany. Hoefling, S., Univ St Andrews, Sch Phys \& Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland.}, article-number = {115308}, author = {Hargart, F. and Mueller, M. and Roy-Choudhury, K. and Portalupi, Simone Luca and Schneider, C. and Hoefling, S. and Kamp, M. and Hughes, S. and Michler, Peter}, doi = {10.1103/PhysRevB.93.115308}, eissn = {2469-9969}, issn = {2469-9950}, journal = {PHYSICAL REVIEW B}, language = {English}, month = {03}, number = 11, orcid-numbers = {Hofling, Sven/0000-0003-0034-4682}, publisher = {AMER PHYSICAL SOC}, research-areas = {Physics}, researcherid-numbers = {Hofling, Sven/C-3140-2013}, title = {Cavity-enhanced simultaneous dressing of quantum dot exciton and biexciton states}, type = {Article}, unique-id = {ISI:000372407200004}, volume = 93, year = 2016 }
2. Schwartz, M., Rengstl, U., Herzog, T., Paul, M., Kettler, J., Portalupi, S. L., Jetter, M., & Michler, P. (2016). Generation, guiding and splitting of triggered single photons from a resonantly excited quantum dot in a photonic circuit. OPTICS EXPRESS, 24(3), Article 3. https://doi.org/10.1364/OE.24.003089
  - BibTeX
  BibTeX
  @article{schwartz2016generation, affiliation = {Schwartz, M (Reprint Author), Univ Stuttgart, Inst Halbleiteropt \& Funkt Grenzflachen, Res Ctr SCoPE, Allmandring 3, D-70569 Stuttgart, Germany. Schwartz, Mario, Univ Stuttgart, Inst Halbleiteropt \& Funkt Grenzflachen, Res Ctr SCoPE, Allmandring 3, D-70569 Stuttgart, Germany. Univ Stuttgart, IQST, Allmandring 3, D-70569 Stuttgart, Germany.}, author = {Schwartz, Mario and Rengstl, Ulrich and Herzog, Thomas and Paul, Matthias and Kettler, Jan and Portalupi, Simone Luca and Jetter, Michael and Michler, Peter}, da = {2017-07-07}, doi = {10.1364/OE.24.003089}, issn = {1094-4087}, journal = {OPTICS EXPRESS}, language = {English}, month = {02}, number = 3, oa = {No}, pages = {3089-3094}, publisher = {OPTICAL SOC AMER}, research-areas = {Optics}, title = {Generation, guiding and splitting of triggered single photons from a resonantly excited quantum dot in a photonic circuit}, type = {Article}, unique-id = {ISI:000371427100110}, volume = 24, year = 2016 }
3. Hargart, F., Roy-Choudhury, K., John, T., Portalupi, S. L., Schneider, C., Höfling, S., Kamp, M., Hughes, S., & Michler, P. (2016). Probing different regimes of strong field light–matter interaction with semiconductor quantum dots and few cavity photons. New Journal of Physics, 18(12), Article 12. http://stacks.iop.org/1367-2630/18/i=12/a=123031
  - BibTeX
  - Link
  BibTeX
  @article{hargart2016probing, abstract = {In this work we present an extensive experimental and theoretical investigation of different regimes of strong field light–matter interaction for cavity-driven quantum dot (QD) cavity systems. The electric field enhancement inside a high-Q micropillar cavity facilitates exceptionally strong interaction with few cavity photons, enabling the simultaneous investigation for a wide range of QD-laser detuning. In case of a resonant drive, the formation of dressed states and a Mollow triplet sideband splitting of up to 45 μ eV is measured for a mean cavity photon number ##IMG## [http://ej.iop.org/images/1367-2630/18/12/123031/njpaa5198ieqn2.gif] {$\langle {n}_{c}\rangle \leqslant 1$} . In the asymptotic limit of the linear AC Stark effect we systematically investigate the power and detuning dependence of more than 400 QDs. Some QD-cavity systems exhibit an unexpected anomalous Stark shift, which can be explained by an extended dressed 4-level QD model. We provide a detailed analysis of the QD-cavity systems properties enabling this novel effect. The experimental results are successfully reproduced using a polaron master equation approach for the QD-cavity system, which includes the driving laser field, exciton-cavity and exciton-phonon interactions.}, author = {Hargart, F and Roy-Choudhury, K and John, T and Portalupi, S L and Schneider, C and Höfling, S and Kamp, M and Hughes, S and Michler, P}, journal = {New Journal of Physics}, number = 12, pages = 123031, title = {Probing different regimes of strong field light–matter interaction with semiconductor quantum dots and few cavity photons}, url = {http://stacks.iop.org/1367-2630/18/i=12/a=123031}, volume = 18, year = 2016 }
  Link
  http://stacks.iop.org/1367-2630/18/i=12/a=123031
4. Portalupi, S. L., Widmann, M., Nawrath, C., Jetter, M., Michler, P., Wrachtrup, J., & Gerhardt, I. (2016). Simultaneous Faraday filtering of the Mollow triplet sidebands with the Cs-D-1 clock transition. NATURE COMMUNICATIONS, 7. https://doi.org/10.1038/ncomms13632
  - BibTeX
  BibTeX
  @article{portalupi2016simultaneous, affiliation = {Portalupi, SL (Reprint Author), Univ Stuttgart, Inst Halbleiteropt \& Funkt Grenzflachen, Ctr Integrated Quantum Sci \& Technol IQST, Allmandring 3, D-70569 Stuttgart, Germany. Portalupi, SL (Reprint Author), Univ Stuttgart, SCoPE, Allmandring 3, D-70569 Stuttgart, Germany. Gerhardt, I (Reprint Author), Univ Stuttgart, Inst Phys 3, Ctr Integrated Quantum Sci \& Technol IQST, Pfaffenwaldring 57, D-70569 Stuttgart, Germany. Gerhardt, I (Reprint Author), Univ Stuttgart, SCoPE, Pfaffenwaldring 57, D-70569 Stuttgart, Germany. Portalupi, Simone Luca; Nawrath, Cornelius; Jetter, Michael; Michler, Peter, Univ Stuttgart, Inst Halbleiteropt \& Funkt Grenzflachen, Ctr Integrated Quantum Sci \& Technol IQST, Allmandring 3, D-70569 Stuttgart, Germany. Portalupi, Simone Luca; Nawrath, Cornelius; Jetter, Michael; Michler, Peter, Univ Stuttgart, SCoPE, Allmandring 3, D-70569 Stuttgart, Germany. Widmann, Matthias; Wrachtrup, Joerg; Gerhardt, Ilja, Univ Stuttgart, Inst Phys 3, Ctr Integrated Quantum Sci \& Technol IQST, Pfaffenwaldring 57, D-70569 Stuttgart, Germany. Widmann, Matthias; Wrachtrup, Joerg; Gerhardt, Ilja, Univ Stuttgart, SCoPE, Pfaffenwaldring 57, D-70569 Stuttgart, Germany. Wrachtrup, Joerg; Gerhardt, Ilja, Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany.}, article-number = {13632}, author = {Portalupi, Simone Luca and Widmann, Matthias and Nawrath, Cornelius and Jetter, Michael and Michler, Peter and Wrachtrup, Jörg and Gerhardt, Ilja}, doi = {10.1038/ncomms13632}, issn = {2041-1723}, journal = {NATURE COMMUNICATIONS}, language = {English}, month = {11}, publisher = {NATURE PUBLISHING GROUP}, research-areas = {Science \& Technology - Other Topics}, title = {Simultaneous Faraday filtering of the Mollow triplet sidebands with the Cs-D-1 clock transition}, type = {Article}, unique-id = {ISI:000388642100001}, volume = 7, year = 2016 }
5. Herzog, T., Schwartz, M., Rengstl, U., Paul, M., Portalupi, S. L., Jetter, M., & and P. Michler. (2016). Triggered single-photon emision by InGaAs QDs in a GaAs/AlGaAs waveguide beam-splitter.
  - BibTeX
  BibTeX
  @conference{noauthororeditor, author = {Herzog, T. and Schwartz, M. and Rengstl, U. and Paul, M. and Portalupi, S. L. and Jetter, M. and and P. Michler}, title = {Triggered single-photon emision by InGaAs QDs in a GaAs/AlGaAs waveguide beam-splitter}, year = 2016 }
6. Kambs, B., Kettler, J., Bock, M., Becker, J. N., Arend, C., Lenhard, A., Portalupi, S. L., Jetter, M., Michler, P., & Becher, C. (2016). Low-noise quantum frequency down-conversion of indistinguishable photons. OPTICS EXPRESS, 24(19), Article 19. https://doi.org/10.1364/OE.24.022250
  - BibTeX
  BibTeX
  @article{kambs2016lownoise, affiliation = {Becher, C (Reprint Author), Univ Saarland, Fachrichtung Expt Phys 7 2, Campus E 2-6, D-66123 Saarbrucken, Germany. Kambs, Benjamin; Bock, Matthias; Becker, Jonas Nils; Arend, Carsten; Becher, Christoph, Univ Saarland, Fachrichtung Expt Phys 7 2, Campus E 2-6, D-66123 Saarbrucken, Germany. Kettler, Jan; Portalupi, Simone Luca; Jetter, Michael; Michler, Peter, Univ Stuttgart, Inst Halbleiteropt \& Funkt Grenzflachen, Res Ctr SCoPE \& IQST, Allmandring 3, D-70569 Stuttgart, Germany. Lenhard, Andreas, Barcelona Inst Sci \& Technol, ICFO Inst Ciencies Foton, Castelldefels 08860, Barcelona, Spain.}, author = {Kambs, Benjamin and Kettler, Jan and Bock, Matthias and Becker, Jonas Nils and Arend, Carsten and Lenhard, Andreas and Portalupi, Simone Luca and Jetter, Michael and Michler, Peter and Becher, Christoph}, doi = {10.1364/OE.24.022250}, issn = {1094-4087}, journal = {OPTICS EXPRESS}, language = {English}, month = {09}, number = 19, orcid-numbers = {Lenhard, Andreas/0000-0002-4128-8392 Becher, Christoph/0000-0003-4645-6882}, pages = {22250-22260}, publisher = {OPTICAL SOC AMER}, research-areas = {Optics}, title = {Low-noise quantum frequency down-conversion of indistinguishable photons}, type = {Article}, unique-id = {ISI:000387537600094}, volume = 24, year = 2016 }
2015
1. Rengstl, U., Schwartz, M., Herzog, T. M., Hargart, F., Paul, M., Portalupi, S. L., Jetter, M., & Michler, P. (2015). On-chip beamsplitter operation on single photons from quasi-resonantly excited quantum dots embedded in GaAs rib waveguides. APPLIED PHYSICS LETTERS, 107(2), Article 2. https://doi.org/10.1063/1.4926729
  - BibTeX
  BibTeX
  @article{rengstl2015onchip, affiliation = {Rengstl, U (Reprint Author), Univ Stuttgart, Inst Halbleiteropt \& Funkt Grenzflachen, Allmandring 3, D-70569 Stuttgart, Germany. Rengstl, U., Univ Stuttgart, Inst Halbleiteropt \& Funkt Grenzflachen, D-70569 Stuttgart, Germany. Univ Stuttgart, Res Ctr SCoPE, D-70569 Stuttgart, Germany.}, article-number = {021101}, author = {Rengstl, Ulrich and Schwartz, Mario and Herzog, Thomas Markus and Hargart, Fabian and Paul, Matthias and Portalupi, Simone Luca and Jetter, Michael and Michler, Peter}, doi = {10.1063/1.4926729}, eissn = {1077-3118}, issn = {0003-6951}, journal = {APPLIED PHYSICS LETTERS}, language = {English}, month = {07}, number = 2, orcid-numbers = {Jetter, Michael/0000-0002-1311-6550}, publisher = {AMER INST PHYSICS}, research-areas = {Physics}, researcherid-numbers = {Jetter, Michael/I-8270-2012}, title = {On-chip beamsplitter operation on single photons from quasi-resonantly excited quantum dots embedded in GaAs rib waveguides}, type = {Publication}, unique-id = {ISI:000358530300001}, volume = 107, year = 2015 }

Patent

2021
1. Michler, P., Portalupi, S., & Weber, J. (2021). Faserkollimator mit stirnseitig betätigbarer Fokussiereinheit und Kollimatorsystem. https://register.dpma.de/DPMAregister/pat/register?AKZ=1020190043529
  - Link
  Link
  https://register.dpma.de/DPMAregister/pat/register?AKZ=1020190043529

Book contributions, editions of books and review articles

2024
1. Michler, P., & Portalupi, S. L. (2024). Semiconductor Quantum Light Sources. De Gruyter. https://doi.org/doi:10.1515/9783110703412
  - Link
  Link
  https://doi.org/10.1515/9783110703412
2. Rodt, S., Vural, H., Portalupi, S. L., Michler, P., & Reitzenstein, S. (2024). Semiconductor quantum dot based quantum light sources. in “Quantum Photonics” in series “Photonic Materials and Application Series”, Eds. Y. Arakawa and D. Bimberg, Elsevier, 2024. https://elsev.spi-global.com/books/EComp/ARAKAWA978-0-323-98378-5/1/OTc4LTAtMzIz/index.php?Type=E
  - Link
  Link
  https://elsev.spi-global.com/books/EComp/ARAKAWA978-0-323-98378-5/1/OTc4LTAtMzIz/index.php?Type=E
2019
1. Hepp, S., Jetter, M., Portalupi, S. L., & Michler, P. (2019). Semiconductor Quantum Dots for Integrated Quantum Photonics. Adv. Quantum Technol. 1900020.
2017
1. Portalupi, S., & Michler, P. (2017). Resonantly excited quantum dots: superior non-classical light sources for quantum information. In Quantum Dots for Quantum Information Technologies, Nanooptics and Nanophotonics Ed. P. Michler. Springer, Berlin, Heidelberg, 2017.

Simone Luca Portalupi

Contact

Publications

2024

BibTeX

Link

BibTeX

Link

BibTeX

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

2023

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

2022

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

2021

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

2020

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

2019

BibTeX

BibTeX

Link

BibTeX

Link

BibTeX

BibTeX

Link