Simple Security Proof of Mode-Pairing Quantum Key Distribution

• URL: http://arxiv.org/abs/2304.09621v1
• Date: Wed, 19 Apr 2023 12:59:43 GMT
• Title: Simple Security Proof of Mode-Pairing Quantum Key Distribution
• Authors: Yi-Fei Lu, Yang Wang, Hong-Wei Li, Mu-Sheng Jiang, Xiao-Xu Zhang, Ying-Ying Zhang, Yu Zhou, Xiao-Lei Jiang, Chun Zhou, Wan-Su Bao
• Abstract summary: Mode-pairing (MP) quantum key distribution (QKD) eliminates the requirements of phase locking and phase tracking. Security of MP-QKD is proved rigorously by examining the consistency of the states detailly between MP-QKD and the fixed-pairing scheme. We explain why the pairing rounds in MP-QKD can be decoupled and determined by the measurement results announced by a third party.
• Score: 14.472257144404168
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Mode-pairing (MP) quantum key distribution (QKD) eliminates the requirements of phase locking and phase tracking compared with twin-field (TF) QKD while still surpassing the fundamental rate-distance limit of QKD. The complexity of the experimental implementation is reduced while the efficiency is also guaranteed. The security of MP-QKD is proved rigorously by examining the consistency of the states detailly between MP-QKD and the fixed-pairing scheme under all of Eve's possible interference, where the latter is equivalent to measurement-device-independent (MDI) QKD. Here we propose a simple and straightforward method to prove the information-theoretic security of MP-QKD. Specifically, an entanglement scheme for MP-QKD is proposed and its security is proved using entanglement purification. Then the security of MP-QKD can be guaranteed with the equivalence of the entanglement scheme and prepare-and-measure scheme for MP-QKD. With this approach, it is beneficial to analyze and understand the performance and security of MP-QKD. We explain why the pairing rounds in MP-QKD can be decoupled and determined by the measurement results announced by a third party, which is the key difference between MP-QKD and MDI-QKD. Moreover, we analyze the security of MP-QKD with the allowed optimal pairing strategy, which is significant for the secret key rate, under collective and coherent attacks.

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