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中国物理学会期刊

基于相干反馈控制的全光关联噪声量子导引特性研究

Einstein-Podolsky-Rosen steering based on coherent feedback control system in all-optical correlated noise channel

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  • 子导引是介于量子纠缠和贝尔非局域性之间的一种特殊的量子关联,具有天然的不对称性。这种不对称性使得量子导引作为量子信息科学的基础资源,成为实现量子安全通信网络的关键。在连续变量量子信息过程中,相干反馈控制系统可以用于增强压缩和控制量子关联,从而提升信息的安全性和操控性。在实际量子通讯过程中,量子系统不可避免地会与外界环境发生退相干现象,同时还会受到信道噪声的干扰,为使受损的量子信息实现恢复并增强,本文提出基于相干反馈控制的全光关联噪声方案,系统研究了反馈能力、噪声、损耗、产生关联噪声的四波混频增益对量子导引的影响。研究发现,在全光关联噪声信道中,引入相干反馈能够有效提升量子导引的恢复能力。全光技术规避了电光转换环节,大幅扩展了工作带宽,为抑制退相干效应、优化量子信息处理中的噪声抑制策略以及发展全光反馈架构下的量子通信技术提供了重要的理论依据。

     

    Quantum steering, which lies between quantum entanglement and Bell non-locality, features the distinctive asymmetric nature. As an essential fundamental resource in quantum information science, it plays a vital role in the implementation of secure quantum communication networks. In continuous-variable quantum information processing, the coherent feedback control is employed to enhance squeezing and manipulate quantum correlations, serving as a powerful and versatile strategy to optimize the performance of diverse quantum communication tasks and further improve the security and manipulability of quantum information systems. In practical quantum communication processes, quantum systems inevitably suffer from decoherence due to coupling with the external environment, as well as the influence of noise in the channel, which severely degrades quantum resource quality. To explore effective methods for restoring and enhancing deteriorated quantum resources, this paper proposes a novel scheme based on an all-optical correlated noise channel within a coherent feedback control system. In the constructed theoretical model, the initial entangled state is generated via a single four-wave mixing process and then this entangled state is transmitted through a four-wave-mixing-based correlated noise channel, accounting for channel transmission loss. A variable beam splitter is employed as a feedback controller to establish a coherent feedback loop for the system. We systematically investigate the influences of feedback capability, channel noise, transmission loss, and four-wave mixing gain on quantum steering characteristics. This scheme combines all-optical technology with coherent feedback control technology. By comparing quantum steering before and after introducing feedback, we find that coherent feedback can effectively recover and enhence quantum steering in all-optical correlated noise channels. Furthermore, the all-optical design eliminates the electro-optical conversion procedures, significantly broadening the operating bandwidth and suppressing additional introduced noise. This work provides important theoretical support for mitigating decoherence effects and optimizing noise suppression in quantum information processing. It also facilitates the development of all-optical coherent feedback schemes for protecting continuousvariable quantum non-local resources in secure quantum communication networks.

     

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