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

作　　者：王发强 张智明 梁瑞生 

机构地区：[1]Laboratory of Photonic Information Technology, School of Information and Photoelectronic Science and Engineering, South China Normal University

出　　处：《Chinese Physics B》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)

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.

关 键 词：DECOHERENCE squeezed reservoir NON-MARKOVIAN QUBIT 

分 类 号：O431.2[机械工程—光学工程]