SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Quantum Dots and Wires (joint session HL/TT)

TT 20.6: Vortrag

Donnerstag, 30. September 2021, 15:15–15:30, H4

Evaluating a Plug&Play Telecom-Wavelength Single-Photon Source for Quantum Key Distribution — 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 Wroclaw, Poland — ³Department of Optics and Photonics, Wroclaw 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, and a maximum tolerable loss of 23.19 dB exploiting optimized temporal filters in the asymptotic limit [1]. 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)