The quantification of quantum nonlocality by characteristic function  

作　　者：WEN Wei 

机构地区：[1]State Key Laboratory for Superlattices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences

出　　处：《Science China(Physics,Mechanics & Astronomy)》2013年第5期947-951,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Basic Research Program of China (Grant No.G2009CB929300)

摘　　要：We propose a way to measure the strength of quantum nonlocal correlation (QNC) based on the characteristic function, which is defined as a response function under the local quantum measurement in a composite system. It is found that the strength of QNC based on the characteristic function is a half-positive-definite function and does not change under any LU operation. Generally, we give a new definition for quantum entanglement using the strength function. Furthermore, we also give a separability-criterion for 2×m-dimensional mixed real matrix. This paper proposes an alternative way for QNC further research.We propose a way to measure the strength of quantum nonlocal correlation （QNC） based on the characteristic function, which is defined as a response function under the local quantum measurement in a composite system. It is found that the strength of QNC based on the characteristic function is a half-positive-definite function and does not change under any LU operation. Generally, we give a new definition for quantum entanglement using the strength function. Furthermore, we also give a separability-criterion for 2 ~ m-dimensional mixed real matrix. This paper proposes an alternative way for QNC further research.

关 键 词：quantum nonlocality characteristic function strength of QNC quantum entanglement Schr6dinger steering 

分 类 号：O413.1[理学—理论物理] O174.52[理学—物理]