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Phase-error-rate Analysis for Quantum Key Distribution with Phase Postselection

Physical review A/Physical review, A(2024)

Univ Sci & Technol China

Cited 0|Views29
Abstract
Quantum key distribution (QKD) stands as a pioneering method for establishing information-theoretically secure communication channels by utilizing the principles of quantum mechanics. In the security proof of QKD, the phase error rate serves as a critical indicator of information leakage and directly influences the security of the shared key bits between communicating parties, Alice and Bob. In estimating the upper bound of the phase error rate, phase randomization and subsequent postselection mechanisms serve pivotal roles across numerous QKD protocols. However, the nonzero interval of phase postselection will introduce intrinsic errors, leading to an overestimation of phase error rate. Here we make a precise phase-error-rate analysis for QKD protocols with phase postselection, which eliminates error rate associated with nonzero interval and helps us to accurately bound the amount of information an eavesdropper may obtain. We further apply our analysis in sending-or-not-sending twin-field quantum key distribution (SNS-TFQKD) and mode-pairing quantum key distribution (MP-QKD). The simulation results confirm that our precise phase error analysis can noticeably improve the key rate performance especially over long distances in practice. Note that our method does not require alterations to the existing experimental hardware or protocol steps. It can be readily applied within current SNS-TF-QKD and MP-QKD for higher key rate generation.
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Quantum Error Correction,Fault-tolerant Quantum Computation,Quantum Machine Learning,Quantum Simulation
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Related Papers
Quantum Science and Engineering Centre (QSec), Nanyang Technological University, Institute of Microelectronics, Peking University, School of Electrical and Electronic Engineering, Nanyang Technological University,Wang Yunxiang,Sun Shihai, Jinan Institute of Quantum technology, SAICT
2021

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要点】: 该论文提出了一种准确估计量子密钥分发中的相位错误率和信息泄漏的方法,通过对具有相位后选择的QKD协议进行分析,可以有效提高密钥生成率。

方法】: 通过准确的相位错误率分析方法,对发送与不发送双场量子密钥分发(SNS-TFQKD)和模式匹配量子密钥分发(MP-QKD)进行研究。

实验】: 通过模拟实验得出的结果表明,该准确的相位错误率分析方法在实际应用中可以显著提高密钥生成率,尤其是在长距离传输中。该方法无需对现有实验硬件或协议步骤进行改动,可以方便地应用于当前的SNS-TF-QKD和MP-QKD中,以获得更高的密钥生成率。