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《Communications in Theoretical Physics》 2017年08期
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Improving Continuous-Variable Measurement-Device-Independent Multipartite Quantum Communication with Optical Amplifiers

郭迎  赵微  李飞  黄端  廖骎  谢才浪  
【摘要】:The developing tendency of continuous-variable(CV) measurement-device-independent(MDI) quantum cryptography is to cope with the practical issue of implementing scalable quantum networks. Up to now, most theoretical and experimental researches on CV-MDI QKD are focused on two-party protocols. However, we suggest a CV-MDI multipartite quantum secret sharing(QSS) protocol use the EPR states coupled with optical amplifiers. More remarkable,QSS is the real application in multipartite CV-MDI QKD, in other words, is the concrete implementation method of multipartite CV-MDI QKD. It can implement a practical quantum network scheme, under which the legal participants create the secret correlations by using EPR states connecting to an untrusted relay via insecure links and applying the multi-entangled Greenberger–Horne–Zeilinger(GHZ) state analysis at relay station. Even if there is a possibility that the relay may be completely tampered, the legal participants are still able to extract a secret key from network communication. The numerical simulation indicates that the quantum network communication can be achieved in an asymmetric scenario, fulfilling the demands of a practical quantum network. Additionally, we illustrate that the use of optical amplifiers can compensate the partial inherent imperfections of detectors and increase the transmission distance of the CV-MDI quantum system.
【作者单位】School
【基金】:Supported by National Natural Science Foundation of China under Grant Nos.61379153,61579725
【分类号】:O413;TN918

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