基于十粒子Cluster态的受控双向量子隐形传态在噪声背景下的纠缠特性及保真度优化方法  

Effects of Noise on Bidirectional Quantum Controlled Teleportation by using Ten-qubit Cluster State and Fidelity Optimization Method

作　　者：贾娜 聂敏 杨光 张美玲[2] 裴昌幸[3] JIA Na;NIE Min;YANG Guang;ZHANG Mei-ling;PEI Chang-xing(School of Communication and Information Engineering, Xi ~ an University of Posts and Telecommunication, Xi＇ an 710121, China;School of Electronics and Information, Northwestern Polytechnical University, Xi＇ an 710 0 7 2, China;State Key Laboratory of Integrated Service Networks, Xi ~ an University of Electronic Science and Technology Xi ＇ an 710 0 71, China)

机构地区：[1]西安邮电大学通信与信息工程学院,西安710121 [2]西北工业大学电子信息工程学院,西安710072 [3]西安电子科技大学综合业务网国家重点实验室,西安710071

出　　处：《量子光学学报》2018年第2期120-133,共14页Journal of Quantum Optics

基　　金：国家自然科学基金(61172071;61201194);陕西省自然科学基础研究计划(2014JQ8318);陕西省国际科技合作与交流计划项目(2015KW-013);陕西省教育厅科研计划项目(16JK1711)

摘　　要：本文提出了一种利用弱测量进行纠缠预补偿的方法。首先分析了十粒子Cluster态的受控双向量子隐形传态的传输过程，通过理论推导给出了不同测量基下相应的幺正变换，成功得到对方待传的未知量子态。在此基础上重点研究了振幅阻尼噪声对量子隐形传态纠缠保真度的影响，并根据弱测量和反馈测量对量子传输信道的调控特性，提出了预补偿的纠缠优化方法。理论分析与性能仿真结果表明，相比于现有纠缠优化方法，本方法不需要引入任何辅助粒子和复杂的系统操作就能获得更高的隐形传态保真度，对克服纠缠退相干带来的隐形传态质量下降具有一定意义。The influence of environmental noise can cause decoherence of quantum states,and the quality of teleportation can be seriously damaged and even leads to communication fails in quantum teleportation. In order to overcome this problem, a method of entanglement pre-compensation using weak measurements is proposed. Firstly, the bidirectional quantum controlled teleportation through ten-qubit cluster state is analyzed, and the corresponding unitary transformation under different measurement bases is given by theoretical derivation, thus the unknown quantum states of the other party to be transmitted is successfully obtained. On this basis, we focus on the study of the amplitude damping effect on teleportation of quantum entanglement fidelity. And according to the control characteristics of weak measurement and reversing measurement over the quantum transmission channel, a method of pre-compensation entanglement optimization is proposed. Theoretical analysis and simulation results show that, comparing with the existing entanglement optimization method, our method does not require the introduction of any auxiliary particles and complex operation system. And higher teleportation fidelity can be obtained obviously. It is of great significance for bidirectional quantum controlled teleportation of cluster state to overcome the decrease of teleportation quality caused by entanglement decoherence.

关 键 词：量子隐形传态 振幅阻尼噪声 纠缠保真度 弱测量 

分 类 号：O431[机械工程—光学工程]