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Title: Non-local correlation and quantum discord in two atoms in the non-degenerate model

Abstract

By using geometric quantum discord (GQD) and measurement-induced nonlocality (MIN), quantum correlation is investigated for two atoms in the non-degenerate two-photon Tavis-Cummings model. It is shown that there is no asymptotic decay for MIN while asymptotic decay exists for GQD. Quantum correlations can be strengthened by introducing the dipole-dipole interaction. The evolvement period of quantum correlation gets shorter with the increase in the dipole-dipole parameter. It is found that there exists not only quantum nonlocality without entanglement but also quantum nonlocality without quantum discord. Also, the MIN and GQD are raised rather than entanglement, and also with weak initial entanglement, there are MIN and entanglement in a interval of death quantum discord. - Highlights: Black-Right-Pointing-Pointer Geometric quantum discord (GQD) and measurement induced nonlocality (MIN) are used to investigate the correlations of two two-level atoms. Black-Right-Pointing-Pointer There is no asymptotic decay for MIN while asymptotic decay exists for GQD. Black-Right-Pointing-Pointer Quantum correlations can be strengthened by introducing the dipole-dipole interaction. Black-Right-Pointing-Pointer There exists not only quantum nonlocality without entanglement but also without discord. Black-Right-Pointing-Pointer Weak initial entanglement leads to MIN and entanglement in intervals of death discord.

Authors:
Publication Date:
OSTI Identifier:
22157025
Resource Type:
Journal Article
Journal Name:
Annals of Physics (New York)
Additional Journal Information:
Journal Volume: 327; Journal Issue: 12; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-4916
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; ASYMPTOTIC SOLUTIONS; ATOMIC MODELS; ATOMS; CORRELATIONS; ENERGY LEVELS; INTERATOMIC FORCES; LOCALITY; PHOTONS; QUANTUM ENTANGLEMENT; QUANTUM MECHANICS

Citation Formats

Mohamed, A. -B.A.,. Non-local correlation and quantum discord in two atoms in the non-degenerate model. United States: N. p., 2012. Web. doi:10.1016/J.AOP.2012.08.003.
Mohamed, A. -B.A.,. Non-local correlation and quantum discord in two atoms in the non-degenerate model. United States. doi:10.1016/J.AOP.2012.08.003.
Mohamed, A. -B.A.,. Sat . "Non-local correlation and quantum discord in two atoms in the non-degenerate model". United States. doi:10.1016/J.AOP.2012.08.003.
@article{osti_22157025,
title = {Non-local correlation and quantum discord in two atoms in the non-degenerate model},
author = {Mohamed, A. -B.A.,},
abstractNote = {By using geometric quantum discord (GQD) and measurement-induced nonlocality (MIN), quantum correlation is investigated for two atoms in the non-degenerate two-photon Tavis-Cummings model. It is shown that there is no asymptotic decay for MIN while asymptotic decay exists for GQD. Quantum correlations can be strengthened by introducing the dipole-dipole interaction. The evolvement period of quantum correlation gets shorter with the increase in the dipole-dipole parameter. It is found that there exists not only quantum nonlocality without entanglement but also quantum nonlocality without quantum discord. Also, the MIN and GQD are raised rather than entanglement, and also with weak initial entanglement, there are MIN and entanglement in a interval of death quantum discord. - Highlights: Black-Right-Pointing-Pointer Geometric quantum discord (GQD) and measurement induced nonlocality (MIN) are used to investigate the correlations of two two-level atoms. Black-Right-Pointing-Pointer There is no asymptotic decay for MIN while asymptotic decay exists for GQD. Black-Right-Pointing-Pointer Quantum correlations can be strengthened by introducing the dipole-dipole interaction. Black-Right-Pointing-Pointer There exists not only quantum nonlocality without entanglement but also without discord. Black-Right-Pointing-Pointer Weak initial entanglement leads to MIN and entanglement in intervals of death discord.},
doi = {10.1016/J.AOP.2012.08.003},
journal = {Annals of Physics (New York)},
issn = {0003-4916},
number = 12,
volume = 327,
place = {United States},
year = {2012},
month = {12}
}