Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Quantum Information (Quantum Communication) I
Q 28.8: Talk
Wednesday, March 16, 2022, 12:15–12:30, Q-H12
A Quantum Key Distribution Testbed using a Plug&Play Telecom-Wavelength Single-Photon Source — Timm Gao1, •Lucas Rickert1, Felix Urban1, Jan Große1, Nicole Srocka1, Sven Rodt1, Anna Musiał2, Kinga Zołnacz3, Paweł Mergo4, Kamil Dybka5, Wacław Urbańczyk3, Grzegorz Sek2, Sven Burger6, Stephan Reitzenstein1, and Tobias Heindel1 — 1Institute of Solid State Physics, Technical University Berlin, 10623 Berlin, Germany — 2Department of Experimental Physics, Wrocław University of Science and Technology, 50-370 Wrocław, Poland — 3Department of Optics and Photonics, Wrocław University of Science and Technology, 50-370 Wrocław, Poland — 4Institute of Chemical Sciences, Maria Curie Sklodowska University, 20-031 Lublin, Poland — 5Fibrain Sp. z o.o., 36-062 Zaczernie, Poland — 6Zuse Institute Berlin, 14195 Berlin, Germany
We report on quantum key distribution (QKD) tests using a 19-inch benchtop single-photon source at 1321 nm based on a fiber-pigtailed quantum dot (QD) integrated into a Stirling cryocooler. Emulating the polarization-encoded BB84 protocol, we achieve an antibunching of g(2)(0)=0.10±0.01, a raw key rate of up to 4.72±0.13 kHz. Exploiting optimized temporal filters [1] in the asymptotic limit a maximum tolerable loss of 23.19 dB can be achieved. Our study represents an important step forward in the development of fiber-based quantum-secured communication networks exploiting sub-Poissonian quantum light sources.
[1] T. Kupko et al., arXiv.2105.03473 (2021)