Decoherence of two-qubit system in a non-Markovian squeezed reservoir
Wang Fa-Qiang(王发强), Zhang Zhi-Ming(张智明)†, and Liang Rui-Sheng(梁瑞生)
Laboratory of Photonic Information Technology, School of Information and Photoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
Abstract The decoherence of two initially entangled qubits coupled with a squeezed vacuum cavity separately is investigated exactly. The results show that, first, in principle, the disentanglement time decreases with the increase of squeeze parameter r, due to the augmenting of average photon number of every mode in the squeezed vacuum cavity. Second, there appear entanglement revivals after the complete disentanglement for the case of even parity initial Bell state, while there occur the entanglement decrease and the entanglement revival before the complete disentanglement for the case of odd parity initial Bell state. The results are quite different from those for the case of qubits in a vacuum cavity.
Received: 16 July 2008
Revised: 11 August 2008
Accepted manuscript online:
PACS:
03.67.Lx
(Quantum computation architectures and implementations)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 60578055), and the
State Key Program for Basic Research of China (Grant Nos
2007CB925204 and 2007CB307001).
Cite this article:
Wang Fa-Qiang(王发强), Zhang Zhi-Ming(张智明), and Liang Rui-Sheng(梁瑞生) Decoherence of two-qubit system in a non-Markovian squeezed reservoir 2009 Chin. Phys. B 18 597
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