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Violation of Bell-CHSH inequality using imperfect photodetectors with optical hybrid states

Authors
  • Kwon, Hyukjoon
  • Jeong, Hyunseok
Type
Published Article
Publication Date
Nov 07, 2013
Submission Date
Sep 08, 2013
Identifiers
DOI: 10.1103/PhysRevA.88.052127
Source
arXiv
License
Yellow
External links

Abstract

We show that a Bell inequality test using an optical hybrid state between a polarized single photon and a coherent field can be highly robust against detection inefficiency. The Bell violation occurs until the efficiency becomes as low as 67% even though its degree becomes small as the detection efficiency degrades. We consider on/off and photon number parity measurements, respectively, for the Bell test and they result in the similar conditions. If the detection efficiency is higher than 98.68%, parity measurements give larger Bell violations close to Cirel'son's bound, while on/off measurements give larger but moderate violations for realistic values of detector efficiency. Experimental realization of our proposal seems feasible in the near future for the implementation of a loophole-free Bell inequality test.

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