集体测量估计量子相干性的性能研究  

Performance of Collective Measurement to Estimate Quantum Coherence

作　　者：袁媛[1,2,3] 钮月萍 龚尚庆[1] 项国勇[2,3] Yuan Yuan;Niu Yueping;Gong Shangqing;Xiang Guoyong(School of Physics,East China University of Science and Technology,Shanghai 200237,China;Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei,Anhui 230026,China;Synergetic Innovation Center of Quantum Information&Quantum Physics,University of Science and Technology of China,Hefei,Anhui 230026,China)

机构地区：[1]华东理工大学物理学院,上海200237 [2]中国科学技术大学量子信息重点实验室,安徽合肥230026 [3]中国科学技术大学量子信息与量子科技前沿协同创新中心,安徽合肥230026

出　　处：《光学学报》2022年第3期208-214,共7页Acta Optica Sinica

基　　金：国家自然科学基金(12004113,11774089,11774334,12034007)。

摘　　要：量子相干性作为资源理论提出后,对它的量化和实验测量的研究一直受到大家广泛的关注。目前已有研究证明集体测量可以提高相干性的测量精度,但在具体实验中实验条件对集体测量估计量子相干性的性能影响还尚不清晰。分别数值模拟了在不同探测效率和资源数条件下集体测量估计相干性的误差,并与其他方法进行了比较。分析发现存在一定参数范围使集体测量的方法在探测效率为60%的情况下比探测效率为90%的态层析的方法更优;此外,随着资源数的增多,集体测量的性能几乎不依赖于量子态和相干性的度量方式,误差均以相同尺度在减小。Since quantum coherence was proposed as a resource theory,the research on its quantification and experimental measurement has always attracted widespread attention.At present,studies have proved that collective measurement can improve the measurement accuracy of coherence,but in experiments,the impact of experimental conditions on the performance of collective measurement to estimate quantum coherence is still unclear.In this paper,we numerically simulate the error of collective measurement to estimate coherence under different detection efficiency and resource number,and we compare them with the errors caused by other methods.We also notice that there exists a parameter range where collective measurement method with the detection efficiency of 60%outperforms the tomography method with the detection efficiency of 90%.In addition,with the increase of the number of resources,the performance of collective measurement is almost independent of the quantum state and coherence measure,and the errors are decreasing at the same scale.

关 键 词：量子光学 量子信息与处理 相干性 光子统计 集体测量 分离测量 

分 类 号：O436[机械工程—光学工程]