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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 2 — Feb. 1, 2013
  • pp: 251–257

Sudden transition and sudden change of quantum discord in dissipative cavity quantum electrodynamics system

Qi-liang He and Jing-bo Xu  »View Author Affiliations

JOSA B, Vol. 30, Issue 2, pp. 251-257 (2013)

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The dynamics of classical correlation and quantum correlation of two qubits in an independent and common dissipative cavity are studied. We show that for an independent case, the quantum correlation keeps constant and the correlation relation decays before the critical time point Ωt¯. On the other hand t>Ωt¯, for the classical correlation does not change and the quantum correlation is lost. These situations demonstrate that the phenomenon of sudden transition between classical and quantum decoherence appears during the time evolution. For the common case, the quantum correlation dynamics is quite different. It is displayed that for some initial states, the quantum correlation can increase up to the critical point of time, after which it decreases, which means that the quantum correlation presents a sudden change of behavior in their decay rates. But for other initial states, the quantum correlation can keep increasing up to some-steady state value. Furthermore, we also investigate the nonzero quantum correlation between two qubits induced by the dissipation of the cavity.

© 2013 Optical Society of America

OCIS Codes
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
(270.5580) Quantum optics : Quantum electrodynamics
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

Original Manuscript: September 6, 2012
Revised Manuscript: November 18, 2012
Manuscript Accepted: November 19, 2012
Published: January 3, 2013

Qi-liang He and Jing-bo Xu, "Sudden transition and sudden change of quantum discord in dissipative cavity quantum electrodynamics system," J. Opt. Soc. Am. B 30, 251-257 (2013)

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