Analysis of coincidence-time loopholes in experimental Bell tests

Published

March 4, 2015

Author(s)

B. G. Christensen, A. Hill, P. G. Kwiat, Emanuel Knill, Sae Woo Nam, Kevin Coakley, Scott Glancy, Krister Shalm, Y. Zhang

Abstract

We apply a distance-based Bell-test analysis method ["Bell inequalities for continuously emitting sources" E. Knill et al. arXiv:14097732 (2014)] to three experimental data sets where conventional analyses failed or required additional assumptions. The first is produced from a classical source exploiting a "coincidence-time loophole" for which standard analysis falsely shows a Bell violation. The second data set is from a source previously shown to violate a Bell inequality; the distance-based analysis agrees with the previous results but with fewer assumptions. Lastly, the third data set does not show a violation with standard analysis despite the high source quality, but is shown to have a strong violation with the distance-based analysis method.

Citation

Physical Review A

Volume

91

Issue

3

Pub Type

Journals

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DOI Link

Keywords

Bell inequalities, coincidence detection, entanglement, photons

Citation

Christensen, B. , Hill, A. , Kwiat, P. , Knill, E. , Nam, S. , Coakley, K. , Glancy, S. , Shalm, K. and Zhang, Y. (2015), Analysis of coincidence-time loopholes in experimental Bell tests, Physical Review A, [online], https://doi.org/10.1103/PhysRevA.91.032105 (Accessed October 7, 2025)