摘要
在给定错误率下,减小量子态分辨中平均消耗的拷贝数,称为最小消耗量子态分辨。最小消耗量子态分辨可以把节省的资源用于后续量子任务,在量子密码等量子任务中具有重要的应用价值。研究了两比特量子态的最小消耗量子态分辨。理论结果表明,即使两比特量子态只有经典关联,没有量子纠缠,纠缠测量仍能远超对两个比特分别进行局域测量的效果。实验结果证实,当错误率要求足够小时,纠缠测量实验装置消耗的拷贝数仅为局域测量的1/12,就可满足错误率要求。该研究结果突出了纠缠测量在最小消耗量子态分辨中的作用,显示了量子测量中纠缠的重要意义。
Reducing the average number of copies consumed in quantum state discrimination under a given error rate is referred to as minimum-consumption quantum state discrimination.Minimum-consumption quantum state discrimination allows the saved resources to be utilized for subsequent quantum tasks,and it holds significant practical value in tasks such as quantum cryptography.In this paper,we investigate minimum-consumption quantum state discrimination of two-qubit quantum states.The theoretical results indicate that even when two-qubit quantum states only possess classical correlations and no quantum entanglement,entangled measurements still far outperform the effects of performing local measurements on the two qubits individually.Experimental results confirm that when the error rate requirement is low enough,the average number of copies consumed by entangled measurement device is only one-twelfth of that consumed by local measurements,while still meeting the error rate requirement.Our research results highlight the role of entangled measurements in minimum-consuption quantum state discrimination,demonstrating the importance of entanglement in quantum measurements.
作者
田博轩
侯志博
项国勇
Tian Boxuan;Hou Zhibo;Xiang Guoyong(CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,Anhui,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2024年第3期281-284,共4页
Laser & Optoelectronics Progress
基金
国家自然科学基金(62222512,12104439,12134014,11974335)
安徽省自然科学基金(2208085J03)。
关键词
量子测量
量子控制
量子分辨
量子信息
quantum measurement
quantum control
quantum discrimination
quantum information
