Effects of squeezing on quantum nonlocality of superpositions of coherent states

Chang-Woo Lee and Hyunseok Jeong
Phys. Rev. A 80, 052105 – Published 10 November 2009

Abstract

We analyze effects of squeezing upon superpositions of coherent states (SCSs) and entangled coherent states for Bell-inequality tests. We find that external squeezing can always increase the degrees of Bell violations, if the squeezing direction is properly chosen, for the case of photon parity measurements. On the other hand, when photon on/off measurements are used, the squeezing operation can enhance the degree of Bell violations only for moderate values of amplitudes and squeezing. We point out that a significant improvement is required over currently available squeezed SCSs in order to directly demonstrate a Bell-inequality violation in a real experiment.

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  • Received 21 July 2009

DOI:https://doi.org/10.1103/PhysRevA.80.052105

©2009 American Physical Society

Authors & Affiliations

Chang-Woo Lee and Hyunseok Jeong*

  • Center for Theoretical Physics, Center for Subwavelength Optics and Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea

  • *h.jeong37@gmail.com

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Issue

Vol. 80, Iss. 5 — November 2009

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