物理学报2025，Vol.74Issue(14)：41-46,6.DOI:10.7498/aps.74.20250268
改进的关联源量子密钥分发
Improved source-correlated quantum key distribution
摘要
Abstract
Based on the basic principles of quantum mechanics,quantum key distribution(QKD)provides unconditional security for long-distance communication.However,existing QKD with relevant source protocols have limited tolerance for source correlation,which greatly reduces the key generation rate and limits the secure transmission distance,thereby limiting their practical deployment.In this work,we propose an improved QKD with correlated source protocol to overcome these limitations by discarding the traditional loss-tolerant security frameworks.Our approach adopts the standard BB84 protocol for the security analysis,under the assumption that the source correlation has a bounded range and characterized inner product of the states.We theoretically analyze the performance of the improved protocol at different levels of source correlation and channel loss.Numerical simulations show that our protocol achieves a much higher secret key rate and longer transmission distance than traditional schemes.In the case of typical parameters and 0 dB loss,our protocol achieves about 1.5-3 times improvement in secret key rate.Additionally,the maximum tolerable loss is enhanced by about 2-6 dB.This highlights a promising direction for enhancing the robustness and practicality of QKD with correlated sources systems,paving the way for their deployment in real-world quantum communication networks.关键词
量子密钥分发/实际安全性/源关联性/BB84协议Key words
quantum key distribution/practical security/source entanglement/BB84 protocol引用本文复制引用
李思莹,朱顺,胡飞飞,黄昱,林旭斌,覃楚珺,曹渊,刘云..改进的关联源量子密钥分发[J].物理学报,2025,74(14):41-46,6.基金项目
中国南方电网有限责任公司科技项目(批准号:000005KK52220034(ZDKJXM20222036))资助的课题. Project supported by the China Southern Power Grid Project of Science and Technology(Grant No.000005KK52220034(ZDKJXM20222036)). （批准号:000005KK52220034(ZDKJXM20222036）
