Decoherence of two-qubit system in a non-Markovian squeezed reservoir 被引量：1

Decoherence of two-qubit system in a non-Markovian squeezed reservoir

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摘要 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 ease 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. 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 ease 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.

作者王发强张智明梁瑞生

机构地区 Laboratory of Photonic Information Technology

出处《Chinese Physics B》 SCIE EI CAS CSCD 2009年第2期597-603,共7页 中国物理B（英文版）

基金 supported by the National Natural Science Foundation of China (Grant No 60578055) the State Key Program for Basic Research of China (Grant Nos 2007CB925204 and 2007CB307001)

关键词 DECOHERENCE squeezed reservoir NON-MARKOVIAN QUBIT decoherence, squeezed reservoir, non-Markovian, qubit

分类号 O431.2 [机械工程—光学工程]

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