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Institut
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Strobel, Tim

Tim Strobel

Herr MSc

PhD-Student
Institut für Halbleiteroptik und Funktionelle Grenzflächen
Semiconductor Optics Group

Kontakt

+49 711 685 69851
E-Mail

Allmandring 3
70569 Stuttgart
Deutschland
Raum: 0.034

Publikationen

2025
1. Strobel, T., Vyvlecka, M., Neureuther, I., Bauer, T., Schäfer, M., Kazmaier, S., Sharma, N. L., Joos, R., Weber, J. H., Nawrath, C., Nie, W., Bhayani, G., Hopfmann, C., Becher, C., Michler, P., & Portalupi, S. L. (2025). Telecom-wavelength quantum teleportation using frequency-converted photons from remote quantum dots. Nature Communications, 16, Article 1. https://doi.org/10.1038/s41467-025-65912-8
  - BibTeX
  - Link
  BibTeX
  @article{Strobel2025, abstract = {A global quantum internet is based on scalable networks, which require reliable quantum hardware. Among them are quantum light sources providing deterministic, high-brightness, high-fidelity entangled photons and quantum memories with coherence times exceeding the millisecond range. Long-distance operation demands quantum light sources emitting at telecommunication wavelengths. A cornerstone for such networks is the demonstration of quantum teleportation. Here, we realize full-photonic quantum teleportation employing semiconductor quantum dots, which can fulfill all the aforementioned requirements. Two remote GaAs quantum dots, emitting in the near-infrared, are used: one as an entangled-photon pair source and the other as a single-photon source. During the experiment, the single photon is prepared in conjugate polarization states and interfaced with the biexciton emission of the entangled pair employing a polarization-selective Bell state measurement. This process teleports the respective polarization state onto the exciton emission of the entangled pair. The frequency mismatch between the triggered sources is erased using two polarization-preserving quantum frequency converters, enabling remote two-photon interference at telecommunication wavelengths, yielding a visibility of 30(1){\%}. A post-selected teleportation fidelity up to 0.721(33), significantly above the classical limit, demonstrates successful quantum teleportation between light from distinct sources. These results mark an important development for semiconductor-based quantum light sources.}, author = {Strobel, Tim and Vyvlecka, Michal and Neureuther, Ilenia and Bauer, Tobias and Sch{\"a}fer, Marlon and Kazmaier, Stefan and Sharma, Nand Lal and Joos, Raphael and Weber, Jonas H. and Nawrath, Cornelius and Nie, Weijie and Bhayani, Ghata and Hopfmann, Caspar and Becher, Christoph and Michler, Peter and Portalupi, Simone Luca}, day = 17, doi = {10.1038/s41467-025-65912-8}, issn = {2041-1723}, journal = {Nature Communications}, month = {11}, number = 1, pages = 10027, title = {Telecom-wavelength quantum teleportation using frequency-converted photons from remote quantum dots}, url = {https://doi.org/10.1038/s41467-025-65912-8}, volume = 16, year = 2025 }
  Link
  https://doi.org/10.1038/s41467-025-65912-8
2024
1. 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, 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
2023
1. 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, 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