Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 31: Materials and Devices for Quantum Technology I
HL 31.4: Talk
Wednesday, March 11, 2026, 15:45–16:00, POT/0251
Time-bin encoded quantum key distribution over 120 km with a telecom quantum dot source — •Jingzhong Yang1, Jipeng Wang1, Joscha Hanel1, Zenghui Jiang1, Raphael Joos2, Michael Jetter2, Eddy. Patrick Rugeramigabo1, Simone. Luca Portalupi2, Peter Michler2, Xiao-Yu Cao3, Hua-Lei Yin3,4, Shan Lei5, Jingzhong Yang1, Michael Zopf1, and Fei Ding1 — 1Leibniz University of Hannover, Hannover, Germany — 2University of Stuttgart, Stuttgart, Germany — 3Nanjing University, Nanjing, China — 4Renmin University of China, Beijing, China — 5Anhui University, Hefei, China
Quantum key distribution (QKD) with deterministic single photon sources has been demonstrated over intercity fiber and free-space channels, but mainly on polarization encoding schemes. In contrast, time-bin encoding offers inherent robustness and has been widely adopted in mature QKD systems using weak coherent laser pulses.
In this work, we presents the first demonstration of the time-bin encoded quantum key distribution (QKD) using the telecom single photons from a quantum dot. A maximum tolerable transmission distance of 127 km is identified as the system error ratio approaches the security threshold. The result demonstrates the feasibility of realizing robust and scalable quantum communication network based on solid-state single-photon technology.
Keywords: Quantum dots; Quantum key distribution; Single-photon source; Telecommunication; Time-bin encoding