为解决量子信令在远距离传输过程中的纯化中继问题,提出了基于两级偏振分光镜的纠缠纯化方案.采用三个偏振分光镜构建方案,第一级含一个偏振分光镜,第二级有两个偏振分光镜,让混合态的量子信令纠缠态通过两级偏振分光镜后,会产生一对新的纠缠态,继而用新的纠缠态来替代原来的混合态,最终实现纯化的目的.对每一种输入态进行分析验证,结果表明,所提出的纠缠纯化方案可以有效地实现量子信令的纯化,具有很好的应用性和操作性.该方案的研究对未来量子通信中信令的传输具有一定的技术参考作用.
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