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

Journal Article · Fri Jul 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.012302· OSTI ID:22038608

Lee, Su-Yong; Kim, Ho-Joon ^[1]; Ji, Se-Wan ^[2]; Nha, Hyunchul ^[1]

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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)

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.

• OSTI ID: 22038608
• Journal Information: Physical Review. A, Vol. 84, Issue 1; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
PHOTONS
QUANTUM ENTANGLEMENT
QUANTUM STATES
QUANTUM TELEPORTATION