Entanglement purification of two-photon systems in multiple degrees of freedom

Entanglement purification of two-photon systems in multiple degrees of freedom
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多自由度双光子系统的纠缠净化

DOI:
10.1007/s11128-020-02697-3
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发表时间:
2020-06
影响因子:
2.5
通讯作者:
高亭
高亭
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
王美玉;闫凤利;高亭

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超纠缠纯化是实现大容量、长距离量子通信的一个非常重要的环节。提出了一种有效的超纠缠纯化方案(hyper-EPP),用于非局域双光子系统的三个自由度(包括偏振、时间和空间模式自由度)的超纠缠纯化.我们的超EPP的构造分为两个步骤诉诸极化时空奇偶校验操作,分别使用量子非爆破检测器和SWAP门。利用该超EPP,可以高效率地校正三个DoF中的位翻转错误。我们的超EPP的实现是由信号光子和相干态之间的交叉克尔非线性通过克尔介质,这可以实现与当前的技术。此外,一些现有的光学元件应用在净化过程中,这为实际实施提供了便利。这对于多自由度超纠缠的长距离大容量量子通信是非常有用的。
Hyperentanglement purification is a very important element for high-capacity long-distance quantum communication. We present an efficient hyperentanglement purification protocol (hyper-EPP) for nonlocal two-photon systems in three degrees of freedom (DoFs), including the polarization, the time-bin, and the spatial-mode DoFs. Our hyper-EPP is constructed with two steps resorting to polarization–time–spatial parity-check operation using the quantum nondemolition detector and SWAP gates, respectively. With this hyper-EPP, the bit-flip errors in the three DoFs can be corrected with high efficiency. The implementation of our hyper-EPP is contributed by a cross-Kerr nonlinearity between the signal photons and a coherent state via Kerr media, which could be achieved with current techniques. Moreover, some currently available optical elements are applied in the purification process, which offer facilities for the practical implementation. It is useful for long-distance high-capacity quantum communication with hyperentanglement in multiple DoFs.
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