Phase randomization detection device for photon source

doi:10.3969/j.issn.1007-5461.2025.05.010

Abstract

Abstract: Quantum key distribution (QKD) is an important technology to ensure information security and resist quantum computing attacks. However, the imperfections of realistic devices pose security risks to QKD system. Aiming at the security issues of phase randomization of photon source in actual QKD system, this paper proposes a phase randomization detection method based on asymmetric FaradaySagnac-Michelson interferometer (AFSMI). The phase correlation factor is tested for two high-speed laser modules, and final security key rate is corrected according to phase correlation factor, effectively improving practical security of QKD when there is phase correlation of photon source.

Key words: quantum information, quantum key distribution, phase randomization detection, asymmetric Faraday-Sagnac-Michelson interferometer, quantum light source, security

CLC Number:

O431.2

HAO Penglei , , HAN Zhengfu , . Phase randomization detection device for photon source[J]. Chinese Journal of Quantum Electronics, 2025, 42(5): 686-693.

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