Silicon photonics-integrated time-domain balanced homodyne detector in continuous-variable quantum key distribution

• URL: http://arxiv.org/abs/2305.03419v1
• Date: Fri, 5 May 2023 10:34:32 GMT
• Title: Silicon photonics-integrated time-domain balanced homodyne detector in continuous-variable quantum key distribution
• Authors: Yanxiang Jia, Xuyang Wang, Xiao Hu, Xin Hua, Yu Zhang, Xubo Guo, Shengxiang Zhang, Xi Xiao, Shaohua Yu, Jun Zou, and Yongmin Li
• Abstract summary: We designed and experimentally demonstrated a silicon photonics-integrated time-domain balanced homodyne detector (TBHD) New variable optical attenuators were used, and a common mode rejection ratio of 86.9 dB could be achieved. In the quantum tomography experiment, the density matrix and Wigner function of a coherent state were reconstructed with 99.97 % fidelity.
• Score: 11.660261692314819
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We designed and experimentally demonstrated a silicon photonics-integrated time-domain balanced homodyne detector (TBHD), whose optical part has dimensions of 1.5 mm * 0.4 mm. To automatically and accurately balance the detector, new variable optical attenuators were used, and a common mode rejection ratio of 86.9 dB could be achieved. In the quantum tomography experiment, the density matrix and Wigner function of a coherent state were reconstructed with 99.97 % fidelity. The feasibility of this TBHD in a continuous-variable quantum key distribution (CVQKD) system was also demonstrated. This facilitates the integration of the optical circuits of the CVQKD system based on the GG02 protocol on the silicon photonics chip using TBHD.

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