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中文摘要：
利用纠缠作为资源的量子通信协议具有安全性好、可靠性高、使用灵活等优势,具有广阔的发展前景,同时也对纠缠光子的保真度提出了一定的要求。提出了一种基于纠缠交换的量子中继策略,在远距离通信者之间设置多级中继,借助经典通信的辅助作用,通过节点间的纠缠交换和纠缠纯化操作为收发双方提供保真度稳定的长程纠缠连接。性能分析表明,通过合理控制中继级数和提高纠缠交换以及纠缠纯化的成功率,可以显著降低系统时延和提高系统吞吐量,为实现全球量子通信提供必不可少的纠缠资源。
英文摘要：
Quantum protocols based on entanglement are known as information security, reliability, flexibility and a broad prospect in use. Meanwhile, the fidelity of photons is also required. A new quantum relay strategy was proposed. By setting multi-relays between distant correspondents and under the assistance of classical communications, the strategy can execute entanglement swapping and entanglement purification to provide the correspondents with remote entanglement connection of stable fidelity. Performance analysis shows that by reasonable control of relay series, improvement of entanglement swapping and entanglement purification, the time delay and throughput can be significantly improved, necessary entanglement resources can be provided for the global quantum communication.
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