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Practical Phase-Coding Side-Channel-Secure Quantum Key Distribution
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All kinds of device loopholes give rise to a great obstacle to practical secure quantum key distribution (QKD). In this article, inspired by the original side-channel-secure protocol [Physical Review Applied 12, 054034 (2019)], a new QKD protocol called phase-coding side-channel-secure (PC-SCS) protocol is proposed. This protocol can be immune to all uncorrelated side channels of the source part and all loopholes of the measurement side. A finite-key security analysis against coherent attack of the new protocol is given. The proposed protocol only requires modulation of two phases, which can avoid the challenge of preparing perfect vacuum states. Numerical simulation shows that a practical transmission distance of 300 km can be realized by the PC-SCS protocol.
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Secure quantum key distribution against correlated leakage source
A new QKD security framework uses round rearrangement and the generalized chain rule to give the first finite-key analysis for correlated sources, and a two-state SNS protocol tolerant to large correlation ranges.
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