Continuous Variable Measurement-Device-Independent Cluster State Quantum Communication Based on Coherent State
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摘要: 由于量子通信协议理论上可以发现任何窃听者的攻击行为，因此其天然具有抗量子计算机攻击的能力。高斯相干态光场相较于纠缠态光场更容易制备和实现，利用其实现量子通信网络更具经济价值和实用价值。该文提出一种利用连续变量(CV)相干态光场就可以实现的测量设备无关(MDI)Cluster态量子通信网络协议。在此网络上可以方便地执行量子秘密共享(QSS)协议和量子会议(QC)协议。该文提出了线型Cluster态实现任意部分用户间QSS协议、星型Cluster态四用户QSS协议和QC协议，并利用纠缠模型分析了选用对称和非对称网络结构时，每种协议密钥率和传输距离之间的变化关系。结论为在量子网络中利用相干态实现QSS和QC协议提供了理论依据。Abstract: Even attacks by quantum computer can be theoretically discovered if utilizing quantum communication protocols. Compared with entangled states, the Continuous Variable (CV) Gaussian coherent state is easier to be prepared. The schemes of quantum communication network based on coherent state will be more economical and practical. A Measurement-Device-Independent (MDI) Cluster state quantum communication network scheme by using coherent state is proposed. Quantum Secret Sharing (QSS) and Quantum Conference (QC) protocols can be implemented in this network. A linear Cluster state scheme is poposed to implement t-out-of-n QSS protocol, a star Cluster state scheme to implement four-user QSS protocol and QC protocol. The entanglement-based CV MDI scheme is used to analyze the relationship between the key rates and transmission distance for each symmetric and asymmetric protocol. The presented schemes provide a concrete reference for establishing CV MDI quantum QSS and QC protocol in quantum networks by using coherent state.
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