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中国物理学会期刊

基于连续变量纠缠态的多用户量子隐形传态网络分析

Analysis of multi-user quantum teleportation network based on continuous-variable entangled states

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  • 量子隐形传态可以实现未知量子态在用户之间的安全传递, 是量子信息科学中的关键技术. 连续变量纠缠态光场能够用于构建量子隐形传态网络, 扩展城域范围量子隐形传态的用户数. 本文分析了基于三种连续变量纠缠态(EPR纠缠态、GHZ纠缠态和线性cluster纠缠态)的量子隐形传态网络方案. 结果表明, 由于不同类型纠缠态具有不同的关联特性, 这些量子隐形传态网络在量子隐形传态的保真度、传输距离和压缩资源消耗量等方面各具优势. 该研究可以为多用户的城域量子隐形传态网络提供参考.

    Quantum teleportation enables the secure transmission of unknown quantum states between remote users and is a key technology in quantum information science. Networks based on continuous-variable entangled states can extend both the user capacity and the transmission distance of quantum teleportation. This paper analyzes quantum teleportation network schemes based on three types of continuous-variable entangled states (Einstein-Podolsky-Rosen (EPR) entangled state, Greenberger-Horne-Zeilinger (GHZ) entangled state, and linear cluster entangled state). The results show that due to the correlation properties of different types of entangled states, various quantum teleportation networks exhibit advantages in terms of fidelity, transmission distance, and quantum resource consumption of quantum teleportation. For low-error-rate applications such as quantum computing, EPR entangled states provide the highest fidelity. When parallel teleportation of multiple states is required, networks based on EPR or cluster entangled states provide the necessary throughput performance. In the scenario where quantum resources are severely limited, the GHZ-based teleportation protocols minimize the number of entangled modes while preserving acceptable fidelity. For applications in demanding controlled teleportation, both GHZ entangled states and cluster entangled states provide the essential multi-party correlations. Notably, cluster states offer a practical trade-off between fidelity and resource overhead, making them attractive for certain implementations. This study provides a reference for designing multi-user metropolitan quantum teleportation networks.

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