Detection loophole in Bell experiments: How postselection modifies the requirements to observe nonlocality

作者：Branciard Cyril^*

来源：Physical Review A, 2011, 83(3): 032123.

DOI：10.1103/PhysRevA.83.032123

A common problem in Bell-type experiments is the well-known detection loophole: if the detection efficiencies are not perfect and if one simply postselects the conclusive events, one might observe a violation of a Bell inequality, even though a local model could have explained the experimental results. In this paper, we analyze the set of all postselected correlations that can be explained by a local model, and show that it forms a polytope, larger than the Bell local polytope. We characterize the facets of this postselected local polytope in the Clauser-Horne-Shimony-Holt scenario, where two parties have binary inputs and outcomes. Our approach gives interesting insights on the detection loophole problem.

• 出版日期2011-3-31