12. Juli 2021 / C. Nawratha), H. Vural, J. Fischer, R. Schaber, S. L. Portalupi, M. Jetter, and P. Michler

Resonance fluorescence of single In(Ga)As quantum dots emitting in the telecom C-band

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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, semiconductor quantum dots at this wavelength promise to provide the outstanding results achieved with this emitter type in the near-infrared spectral region. Here, we study resonance fluorescence from InAs/GaAs quantum dots emitting in the telecom C-band under continuous wave and pulsed excitation. For the prior case, the quantum dot is excited in the strong driving regime and the characteristic Mollow triplet is observed allowing to draw conclusions on the nature and quantitative influence of different decoherence mechanisms on the emission. Furthermore, under pulsed excitation, highly pure single-photon emission (g(2)(0)=0.023 ± 0.019) is demonstrated and a measurement of the photon indistinguishability (VTPI=0.144 ± 0.015; full width at half maximum of the time window for post-selection of (305 ± 33)ps with an associated maximally attainable value VTPI,p=0.955) is presented. In the process of making the emission properties of telecom quantum dots comparable to their well-established counterparts emitting in the near-infrared spectral region, these results represent a benchmark and provide valuable information for future optimization of sample structures.




The authors gratefully acknowledge the funding by the German Federal Ministry of Education and Research (BMBF) via the project Q.Link.X (No. 16KIS0862) and the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 899814 (Qurope). The work reported in this paper was partially funded by Project No. EMPIR 17FUN06 SIQUST. This project has received funding from the EMPIR programme co-financed by the Participating States and from the European Union's Horizon 2020 research and innovation program. For fruitful discussions, the authors wish to thank E. Flagg, K. Konthasinghe, and J. Maisch. In particular, the authors wish to thank K. V. Reddy from PriTel, Inc. for invaluable support.


Publication: Resonance fluorescence of single In(Ga)As quantum dots emitting in the telecom C-band
externer Link Applied Physics Letters

Contact person: C. Nawrath

 

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