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Calculation of Covariance Matrix for Multi-mode Gaussian States in Decoherence Processes |
| XIANG Shao-Hua1,2, SHAO Bin2, SONG Ke-Hui1 |
| 1Department of Physics and Electronic Information Science, Huaihua University, Huaihua 4180082Department of Physics, Beijing Institute of Technology, Beijing 100081 |
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| Cite this article: |
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XIANG Shao-Hua, SHAO Bin, SONG Ke-Hui 2009 Chin. Phys. Lett. 26 030304 |
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Abstract We investigate the dynamics of n single-mode continuous variable systems in a generic Gaussian state under the influence of the independent and correlated noises making use of the characteristic function method. In two models the bath is assumed to be a squeezed thermal one. We derive an explicit input-output expression between the initial and final covariance matrices. As an example, we study the evolution of entanglement of three-mode Gaussian state embedded in two noisy models.
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03.67.Mn
03.65.Yz
03.67.-a
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Received: 02 July 2008
Published: 19 February 2009
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| PACS: |
03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.67.-a
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(Quantum information)
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