Discrimination of coherent states via atom–field interaction without rotation wave approximation  

作　　者：Jin-Hua Zhang Fu-Lin Zhang Mai-Lin Liang Zhi-Xi Wang Shao-Ming Fei 

机构地区：[1]Department of Physics,Xinzhou Teachers University,Xinzhou 034000,China [2]Department of Physics,School of Science,Tianjin University,Tianjin 300072,China [3]School of Mathematical Sciences,Capital Normal University,Beijing 100048,China [4]Max-Planck-Institute for Mathematics in the Sciences,D-04103 Leipzig,Germany

出　　处：《Communications in Theoretical Physics》2023年第6期78-85,共8页理论物理通讯（英文版）

基　　金：funded by the NSF of China(Grant Nos.11675119,12075159,11575125,12171044);Shanxi Education Department Fund(2020L0543);Beijing Natural Science Foundation(Z190005);Academy for Multidisciplinary Studies,Capital Normal University;the Academician Innovation Platform of Hainan Province;the Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology(No.SIQSE202001)

摘　　要：Quantum state discrimination is an important part of quantum information processing.We investigate the discrimination of coherent states through a Jaynes-Cummings(JC)model interaction between the field and the ancilla without rotation wave approximation(RWA).We show that the minimum failure probability can be reduced as RWA is eliminated from the JC model and the non-RWA terms accompanied by the quantum effects of fields(e.g.the virtualphoton process in the JC model without RWA)can enhance the state discrimination.The JC model without RWA for unambiguous state discrimination is superior to ambiguous state discrimination,particularly when the number of sequential measurements increases.Unambiguous state discrimination implemented via the non-RWA JC model is beneficial to saving resource costs.

关 键 词：state discrimination Jaynes-Cummings model rotation wave approximation 

分 类 号：O413[理学—理论物理]