基于时间-极化超纠缠的纠缠纯化  

Entanglement Purification Based on Time-polarization Hyperentanglement

作　　者：潘垒 韩菲 朱孟正[1] PAN Lei;HAN Fei;ZHU Mengzheng(School of Physics&Electronic Information,Huaibei Normal University,Huaibei,Anhui 235000)

机构地区：[1]淮北师范大学物理与电子信息学院,安徽淮北235000

出　　处：《绵阳师范学院学报》2024年第11期14-19,共6页Journal of Mianyang Teachers＇ College

基　　金：安徽省自然科学基金面上项目(1808085MA08);安徽省高等学校质量工程项目(2021jxtd255).

摘　　要：量子通信中,双方共享的量子态会受到噪声环境的影响,从而使最大纠缠态退化为混合态.为了保证通信双方的信息准确度,需对该混合态进行处理.混合态普遍存在相位翻转错误或者位翻转错误,而相位翻转错误不可直接纠正,需转化为位翻转错误后进行纯化.故提出了一种偏振纠缠的纯化比特方案,在协议中利用时间片段纠缠为资源纠正偏振状态的位翻转错误.新的混合态的保真度和可靠性比初始态有明显的提高,说明该纠缠纯化协议是成功的.时间自由度比空间自由度更加节约量子使用资源,所提方案更具有实用性和有效性.In quantum communication,the quantum state shared by both parties will be affected by the noise environment,causing the maximum entangled state to degenerate into a mixed state.In order to ensure the accuracy of information between communicating parties,this mixed state needs to be processed.Phase flip errors or bit flip errors are common in mixed states.Phase flip errors cannot be corrected directly and need to be converted into bit flip errors and then purified.Therefore,a purified bit scheme with polarization entanglement is proposed.In the pro-tocol,time segment entanglement is used to correct the bit flip error of the polarization state for the resource.The fidelity and reliability of the new mixed state are significantly improved compared to the initial state described at the beginning,indicating that the entanglement purification protocol is successful.The time degree of freedom saves quantum resources more than the space degree of freedom,and the proposed solution is more practical and effective.

关 键 词：量子通信 超纠缠态 时间纠缠 纯化 

分 类 号：O413.1[理学—理论物理]