基于量子行走的确定性远程光子态交换

doi:10.3969/j.issn.1007-5461.2023.06.012

量子电子学报 ›› 2023, Vol. 40 ›› Issue (6): 924-932.doi: 10.3969/j.issn.1007-5461.2023.06.012

基于量子行走的确定性远程光子态交换

曾妙娜 1, 杨名 1,2*

( 1 安徽大学物理与光电工程学院, 安徽合肥 230601; 2 合肥综合性国家科学中心人工智能研究院, 安徽合肥 230088 )

收稿日期:2022-05-04 修回日期:2022-05-11 出版日期:2023-11-28 发布日期:2023-11-28
通讯作者: E-mail: mingyang@ahu.edu.cn E-mail:E-mail: mingyang@ahu.edu.cn
作者简介:曾妙娜 ( 1995 - ), 女, 福建漳州人, 研究生, 主要从事通过量子行走实现量子态操控方面的研究。E-mail: b19201001@stu.ahu.edu.cn
基金资助:
安徽省自然科学基金 (2008085MA16, 2008085QA26), 安徽省高校协同创新项目 (GXXT-2022-039)

Deterministic remote photonic state swapping via quantum walk

ZENG Miaona 1 , YANG Ming 1, 2*

( 1 School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China; 2 Institute of Artificial Intelligence, Hefei Comprehensive National Science Center, Hefei 230088, China )

Received:2022-05-04 Revised:2022-05-11 Published:2023-11-28 Online:2023-11-28

摘要/Abstract

摘要： 基于光学量子行走, 设计了一个能够实现远程光子偏振态和空间态交换的方案, 使得光子的低质量偏振纠缠与高质量空间纠缠发生互换, 最终使远程通信双方获得最大偏振纠缠态。也就是说, 利用光子在空间自由度上的远程纠缠资源来辅助, 可提高光子在偏振自由度上的远程纠缠。所有的后选择结果都是成功的, 因此这里的态交换是确定性的。该方案不仅适用于Werner态, 还适用于任意未知的远程光子偏振态, 因此该方案还具有普适性。方案中的半波片和光束移位器都是成熟的光学器件, 所以该方案简单易行, 为远程偏振纠缠操控提供了另一种备选方案。

关键词: 量子光学, 态交换, 量子行走, 空间自由度

Abstract: Based on a three-step photonic quantum walk scheme, a swapping protocol is proposed for the spatial state and polarization state of two remotely distributed photons, so that the high-quality spatially entangled state and the poor polarization-entangled state of two photons can be swapped, enabling the two remote photons to be in maximally polarization-entangled state. That is to say, the polarization entanglement of the remotely distributed photons can be enhanced with the help of the spatial entanglement of them. Since all the post-selected states are maximally entangled states, the swapping scheme is realized in a deterministic way. The scheme is not only applicable to Werner state but also to arbitrary unknown remote polarization-entangled state, so the scheme is universal in this sense. In addition, half-wave plates and beam displacers used in the scheme are ordinary optical elements, so the scheme is simple and feasible, providing an alternative scheme for manipulating remote polarization entanglement in quantum communication.

Key words: quantum optics, state swapping, quantum walk, spatial degree of freedom

中图分类号:

O431.2

曾妙娜, 杨名, . 基于量子行走的确定性远程光子态交换[J]. 量子电子学报, 2023, 40(6): 924-932.

ZENG Miaona , YANG Ming , . Deterministic remote photonic state swapping via quantum walk[J]. Chinese Journal of Quantum Electronics, 2023, 40(6): 924-932.

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基于量子行走的确定性远程光子态交换

Deterministic remote photonic state swapping via quantum walk

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