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Title: Enhancing quantum entanglement for continuous variables by a coherent superposition of photon subtraction and addition

Abstract

We investigate how the entanglement properties of a two-mode state can be improved by performing a coherent superposition operation ta+ra{sup {dagger}} of photon subtraction and addition, proposed by Lee and Nha [Phys. Rev. A 82, 053812 (2010)], on each mode. We show that the degree of entanglement, the Einstein-Podolsky-Rosen-type correlation, and the performance of quantum teleportation can be all enhanced for the output state when the coherent operation is applied to a two-mode squeezed state. The effects of the coherent operation are more prominent than those of the mere photon subtraction a and the addition a{sup {dagger}} particularly in the small-squeezing regime, whereas the optimal operation becomes the photon subtraction (case of r=0) in the large-squeezing regime.

Authors:
;  [1];  [2];  [1];  [3]
  1. Department of Physics, Texas A and M University at Qatar, P.O. Box 23874, Doha (Qatar)
  2. School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-012 (Korea, Republic of)
  3. (Germany)
Publication Date:
OSTI Identifier:
22038608
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; PHOTONS; QUANTUM ENTANGLEMENT; QUANTUM STATES; QUANTUM TELEPORTATION

Citation Formats

Lee, Su-Yong, Kim, Ho-Joon, Ji, Se-Wan, Nha, Hyunchul, and Institute fuer Quantenphysik, Universitaet Ulm, D-89069 Ulm. Enhancing quantum entanglement for continuous variables by a coherent superposition of photon subtraction and addition. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.012302.
Lee, Su-Yong, Kim, Ho-Joon, Ji, Se-Wan, Nha, Hyunchul, & Institute fuer Quantenphysik, Universitaet Ulm, D-89069 Ulm. Enhancing quantum entanglement for continuous variables by a coherent superposition of photon subtraction and addition. United States. doi:10.1103/PHYSREVA.84.012302.
Lee, Su-Yong, Kim, Ho-Joon, Ji, Se-Wan, Nha, Hyunchul, and Institute fuer Quantenphysik, Universitaet Ulm, D-89069 Ulm. Fri . "Enhancing quantum entanglement for continuous variables by a coherent superposition of photon subtraction and addition". United States. doi:10.1103/PHYSREVA.84.012302.
@article{osti_22038608,
title = {Enhancing quantum entanglement for continuous variables by a coherent superposition of photon subtraction and addition},
author = {Lee, Su-Yong and Kim, Ho-Joon and Ji, Se-Wan and Nha, Hyunchul and Institute fuer Quantenphysik, Universitaet Ulm, D-89069 Ulm},
abstractNote = {We investigate how the entanglement properties of a two-mode state can be improved by performing a coherent superposition operation ta+ra{sup {dagger}} of photon subtraction and addition, proposed by Lee and Nha [Phys. Rev. A 82, 053812 (2010)], on each mode. We show that the degree of entanglement, the Einstein-Podolsky-Rosen-type correlation, and the performance of quantum teleportation can be all enhanced for the output state when the coherent operation is applied to a two-mode squeezed state. The effects of the coherent operation are more prominent than those of the mere photon subtraction a and the addition a{sup {dagger}} particularly in the small-squeezing regime, whereas the optimal operation becomes the photon subtraction (case of r=0) in the large-squeezing regime.},
doi = {10.1103/PHYSREVA.84.012302},
journal = {Physical Review. A},
issn = {1050-2947},
number = 1,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}