Better Bell-inequality violation by collective measurements

Yeong Cherng Liang, Andrew C. Doherty

研究成果: Article同行評審

26 引文 斯高帕斯(Scopus)

摘要

The standard Bell-inequality experiments test for violation of local realism by repeatedly making local measurements on individual copies of an entangled quantum state. Here we investigate the possibility of increasing the violation of a Bell inequality by making collective measurements. We show that the nonlocality of bipartite pure entangled states, quantified by their maximal violation of the Bell-Clauser-Horne inequality, can always be enhanced by collective measurements, even without communication between the parties. For mixed states we also show that collective measurements can increase the violation of Bell inequalities, although numerical evidence suggests that the phenomenon is not common as it is for pure states.

原文English
文章編號052116
期刊Physical Review A - Atomic, Molecular, and Optical Physics
73
發行號5
DOIs
出版狀態Published - 2006

All Science Journal Classification (ASJC) codes

  • 原子與分子物理與光學

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