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Influence of Intrinsic Decoherence on Entanglement of Superconducting Charge Qubit in a Resonant Cavity |
| LIU Xiao-Nan;SHAO Bin;ZOU Jian |
| Department of Physics, Beijing Institute of Technology, Beijing 100081 |
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| Cite this article: |
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LIU Xiao-Nan, SHAO Bin, ZOU Jian 2005 Chin. Phys. Lett. 22 2997-3000 |
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Abstract Taking the intrinsic decoherence effect into account, we investigate the entanglement dynamics of a superconducting charge qubit in a single-mode optical cavity. Concurrence, as the measure of entanglement of the coupled field-junction system, is calculated. In comparison, we also consider the entanglement of the system by using the entanglement parameter based on the ratio between mutual entropy and partial Von-Neumann entropy to investigate how the intrinsic decoherence affects the entanglement of the coupling system. Our results show that the evolution of the entanglement parameter has the behaviour similar to the concurrence and it is thus the well measure of entanglement for the mixed state in such a coupling system.
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| Keywords:
03.65.Ud
03.67.Pp
85.25.Cp
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Published: 01 December 2005
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| PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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03.67.Pp
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(Quantum error correction and other methods for protection against decoherence)
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85.25.Cp
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(Josephson devices)
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