论文标题
连续变量的测量装置独立于序列后独立量子会议
Continuous-variable measurement device independent quantum conferencing with post-selection
论文作者
论文摘要
分析了连续变量（CV），测量设备独立（MDI）量子密钥分布（QKD）协议，使三方能够连接以进行量子会议。我们在不受信任的继电器和选择后程序中使用了广义的铃铛检测，在该程序中，遥远的各方就其准备好的相干状态的四足动物位移的迹象进行了调和。我们在集体纯损失攻击下得出了协议的速率，与等效的非验证协议相比，证明了率距离的提高。在所有各方与继电器相同距离的对称配置中，我们发现了6公里以上的正键率。这种选择后技术可用于以更长距离的方式提高多方量子会议协议的速度，而较短距离的性能降低。
A continuous variable (CV), measurement device independent (MDI) quantum key distribution (QKD) protocol is analyzed, enabling three parties to connect for quantum conferencing. We utilise a generalised Bell detection at an untrusted relay and a postselection procedure, in which distant parties reconcile on the signs of the displacements of the quadratures of their prepared coherent states. We derive the rate of the protocol under a collective pure-loss attack, demonstrating improved rate-distance performance compared to the equivalent non-post-selected protocol. In the symmetric configuration in which all the parties lie the same distance from the relay, we find a positive key rate over 6 km. Such postselection techniques can be used to improve the rate of multi-party quantum conferencing protocols at longer distances at the cost of reduced performance at shorter distances.
