Quantum nonlocality evolution for two entangled mesoscopic fields under decoherence  

作　　者：Zhao-Song Tan Shou-Bang Yang Zhen-Biao Yang Shi-Biao Zheng 

机构地区：[1]Fujian Key Laboratory of Quantum Information and Quantum Optics,Fuzhou University,Fuzhou,Fujian 350116,China

出　　处：《Communications in Theoretical Physics》2024年第1期24-28,共5页理论物理通讯（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12274080,11875108)。

摘　　要：Investigation of the nonlocality evolution of entangled mesoscopic fields under decoherence not only is important for understanding the quantum–classical transition,but also has relevance to quantum communication and quantum computation protocols based on continuous variables.According to previous formulations of Bell inequalities,the system loses nonlocal features far before the disappearance of entanglement.We here construct a new version of Bell signal based on rotated and displaced on–off correlations,with which the Bell inequality is violated as long as there remains entanglement and the field state components keep quasiorthogonal.Consequently,the nonlocal character revealed by our formulation decays much slower compared with those based on previous ones.More importantly,there exists a wide regime where the Bell inequality is restored with previous formulations but remains to be violated based on our correlation operators.

关 键 词：entangled mesoscopic fields rotated and displaced on-off correlations Bell inequality nonlocality evolution 

分 类 号：O413[理学—理论物理]