Journal
OPTICS COMMUNICATIONS
Volume 284, Issue 9, Pages 2393-2401Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2010.11.056
Keywords
Classical correlation; Quantum discord; Entanglement; Heat bath
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Funding
- Hunan Provincial Education Department, China [06B004]
- Natural Science Foundation of Hunan Province, China [07JJ3123, 09JJ5005]
- Science and Technology Program of Hunan Province [200993072]
- Key Discipline in Changsha University of Science and Technology
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Classical correlation (CC), quantum discord (QD) and entanglement (QE) of two qubits in one-side and two-side decoherence models are investigated. The sudden change of quantum discord (DSC) as well as classical correlation and sudden death of entanglement (ESD) are found. It is proved that QE (QD) presents no sudden change (sudden death). We prove that, for nonzero occupation number of the reservoir. QE must suffer sudden death; For zero occupation number and X-form initial states, we obtain the states which are robust and the states which experience sudden death. It is verified that if DSC and ESD occur under one-side decoherence, then it must appear in the two-side decoherence, while the reverse does not hold. We obtain the boundaries of CC-QE plane and QD-QE plane, and give the state possessing maximal amount of CC (QD) for a given amount of QE. (C) 2010 Elsevier B.V. All rights reserved.
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