Time-bin encoded quantum key distribution over 120 km with a telecom quantum dot source
- URL: http://arxiv.org/abs/2506.15520v1
- Date: Wed, 18 Jun 2025 14:55:01 GMT
- Title: Time-bin encoded quantum key distribution over 120 km with a telecom quantum dot source
- Authors: Jipeng Wang, Joscha Hanel, Zenghui Jiang, Raphael Joos, Michael Jetter, Eddy Patrick Rugeramigabo, Simone Luca Portalupi, Peter Michler, Xiao-Yu Cao, Hua-Lei Yin, Shan Lei, Jingzhong Yang, Michael Zopf, Fei Ding,
- Abstract summary: Quantum key distribution (QKD) with deterministic single photon sources has been demonstrated over intercity fiber and free-space channels.<n>Time-bin encoding offers inherent robustness and has been widely adopted in mature QKD systems.<n>This work provides the first experimental validation of integrating a quantum dot single-photon source with time-bin encoding in a telecom-band QKD system.
- Score: 9.604654173535646
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum key distribution (QKD) with deterministic single photon sources has been demonstrated over intercity fiber and free-space channels. The previous implementations relied mainly on polarization encoding schemes, which are susceptible to birefringence, polarization-mode dispersion and polarization-dependent loss in practical fiber networks. In contrast, time-bin encoding offers inherent robustness and has been widely adopted in mature QKD systems using weak coherent laser pulses. However, its feasibility in conjunction with a deterministic single-photon source has not yet been experimentally demonstrated. In this work, we construct a time-bin encoded QKD system employing a high-brightness quantum dot (QD) single-photon source operating at telecom wavelength. Our proof-of-concept experiment successfully demonstrates the possibility of secure key distribution over fiber link of 120 km, while maintaining extraordinary long-term stability over 6 hours of continuous operation. This work provides the first experimental validation of integrating a quantum dot single-photon source with time-bin encoding in a telecom-band QKD system. In addition, it demonstrates the highest secure key rate among the time-bin QKDs based on single-photon sources. This development signifies a substantial advancement in the establishment of a robust and scalable QKD network based on solid-state single-photon technology
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