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Dynamics of two-level systems beyond the rotating-wave approximation

  • J. Song
  • Y. Xia
  • X. D. Sun
  • Y. Zhang
  • B. Liu
  • H. S. Song
Regular Article

Abstract

We study the dynamics of quantum discord and entanglement in a two-qubit system coupled to the same quantized field without rotating-wave approximation. In the absence of initial correlations, we show that maximal quantum discord (entanglement) can be obtained in the strong coupling regime. Analytical result corresponding to an effective Hamiltonian is given. In a deep strong coupling regime, sudden death and sudden birth of entanglement are observed, while the peak value of quantum discord is reached periodically. The results of our investigation also suggest that some special quantum state with non-zero quantum discord may be created.

Keywords

Quantum Optics 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • J. Song
    • 1
  • Y. Xia
    • 2
    • 3
  • X. D. Sun
    • 1
  • Y. Zhang
    • 1
  • B. Liu
    • 3
  • H. S. Song
    • 3
  1. 1.Department of PhysicsHarbin Institute of TechnologyHarbinP.R. China
  2. 2.Department of PhysicsFuzhou UniversityFuzhouP.R. China
  3. 3.School of Physics and Optoelectronic TechnologyDalian University of TechnologyDalianP.R. China

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