Surpassing the currently achievable distance of quantum key distribution based on sending-or-not-sending approach

• URL: http://arxiv.org/abs/2602.03173v1
• Date: Tue, 03 Feb 2026 06:41:58 GMT
• Title: Surpassing the currently achievable distance of quantum key distribution based on sending-or-not-sending approach
• Authors: Georgi Bebrov,
• Abstract summary: We propose a sending-or-not-sending phase-matching QKD protocol (SNS-PM-QKD)<n>We present a security analysis of SNS-PM-QKD in the achievable (infinite key) regime under collective attacks.<n>Our results show that SNS-PM-QKD achieves greater transmission distances than existing protocols, highlighting its potential for long-distance quantum communication.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Protocols based on the sending-or-not-sending (SNS) principle have been intensively studied in recent years and have been shown to enable the longest transmission distances in quantum key distribution (QKD). In this work, we propose a sending-or-not-sending phase-matching QKD protocol (SNS-PM-QKD) that improves tolerance to phase mismatch, thereby extending the achievable transmission distance. We present a security analysis of SNS-PM-QKD in the asymptotic (infinite-key) regime under collective attacks. The performance of the proposed protocol is compared with that of standard phase-matching QKD, theoretical SNS-type twin-field QKD protocols (SNS-TF-QKD), and an experimental SNS-TF-QKD operated over transmission distances of up to 1002km. Our results show that SNS-PM-QKD achieves greater transmission distances than these existing protocols, highlighting its potential for long-distance quantum communication.

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