Security of quantum key distribution with imperfect phase randomisation

• URL: http://arxiv.org/abs/2210.08183v3
• Date: Mon, 8 Jan 2024 10:44:39 GMT
• Title: Security of quantum key distribution with imperfect phase randomisation
• Authors: Guillermo Curr\'as-Lorenzo, Shlok Nahar, Norbert L\"utkenhaus, Kiyoshi Tamaki, Marcos Curty
• Abstract summary: We provide a security proof for decoy-state QKD with correlated phases that offers key rates close to the ideal scenario. Our work paves the way towards high-performance secure QKD with practical laser sources, and may have applications beyond QKD.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The performance of quantum key distribution (QKD) is severely limited by multiphoton emissions, due to the photon-number-splitting attack. The most efficient solution, the decoy-state method, requires that the phases of all transmitted pulses are independent and uniformly random. In practice, however, these phases are often correlated, especially in high-speed systems, which opens a security loophole. Here, we address this pressing problem by providing a security proof for decoy-state QKD with correlated phases that offers key rates close to the ideal scenario. Our work paves the way towards high-performance secure QKD with practical laser sources, and may have applications beyond QKD.

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