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基于量子分组纠缠的到达时间测量增强研究

DOI: 10.13190/jbupt.201106.33.yangchy, PP. 33-37

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Abstract:

根据量子测距原理,采用纠缠压缩态的量子脉冲代替经典的电磁脉冲可极大地提高到达时间的测量精度,但在实际的有损通道当中采用完全纠缠态量子脉冲的测量稳健性很差。相比之下,采用部分纠缠态可以有效地提高测量的稳健性,但其测量精度上会有所下降。鉴于上述的精度与稳健性之间的矛盾问题,提出了多结构分组纠缠的测量方法,并详细推导了纠缠度、量子传输效率与测量精度的之间的关系,得到了在特定量子通道传输效率条件下,纠缠分组结构、量子压缩光子数和最佳的量子纠缠度的选择方法,使得纠缠所能获得的测量精度增益达到最大。

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