基于态区分检测器的连续变量量子密钥分发OA

Aiming at the problem that the traditional coherent detector was limited by the standard quantum limit(SQL)in the continuous variable quantum key distribution(CVQKD)protocol,a CVQKD protocol based on state-discrimination detector(SDD),namely SDD-CVQKD,was proposed.The protocol replaced the traditional coherent de-tector with SDD,and used multi-round adaptive measurement and MAP criterion to achieve high-precision discrimina-tion of discrete modulated coherent states,which reduced the detection error probability.The security bounds were de-rived under the security model of reverse reconciliation and collective beam-splitting attack.Numerical simulation re-sults show that the proposed protocol is superior to the traditional CVQKD protocol in terms of channel parameters and secret key rate,and even exceeds the PLOB bound,showing higher security.