摘要
We propose to detect quantum entanglement by a condition of local measurements.We find that this condition can efficiently detect the pure entangled states for both discrete and continuous variable systems.It does not depend on interference of decoherence from noise and detection loss in some systems,which allows a loophole-free test in real experiments.In particular,it is a necesary condition for the violation of some generalized Bell inequalities.
作者
XIE Qing
WU Xian-Xin
DING Xiang-Mao
YANG Wen-Li
YUE Rui-Hong
FAN Heng
谢庆;吴贤新;丁祥茂;杨文力;岳瑞宏;范桁(Faculty of Science,Ningbo University,Ningbo 315211;Institute of Physics,Chinese Academy of Sciences,Beijing 100190;Institute of Applied Mathematics,Academy of Mathematics and System Science,Chinese Academy of Sciences,Beijing 100190;Institute of Modern Physics,Northwest University,Xi’an 710069)
基金
Supported by the National Natural Science Foundation of China under Grant Nos 10931006,10975180,10974247 and 11075126
the National Basic Research Program of China under Grant No 2010CB922904.
