Evolution of entanglement between qubits ultra-strongly coupling to a quantum oscillator  

作　　者：马悦 董锟 田贵花 

机构地区：[1]School of Sciences,Beijing University of Posts and Telecommunications

出　　处：《Chinese Physics B》2014年第9期216-221,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.10875018 and 60578043)

摘　　要：We investigate the dynamics of two qubits coupled with a quantum oscillator by using the adiabatic approximation method. We take account of the interaction between the qubits and show how the entanglement is affected by the interaction parameter. The most interesting result is that we can prolong the entanglement time or improve the entanglement degree by using an appropriate interaction parameter. As the generation and preservation of entanglement of qubits are crucial for quantum information processing, our research will be useful.We investigate the dynamics of two qubits coupled with a quantum oscillator by using the adiabatic approximation method. We take account of the interaction between the qubits and show how the entanglement is affected by the interaction parameter. The most interesting result is that we can prolong the entanglement time or improve the entanglement degree by using an appropriate interaction parameter. As the generation and preservation of entanglement of qubits are crucial for quantum information processing, our research will be useful.

关 键 词：Jaynes-Cummings model ultra-strong coupling adiabatic approximation 

分 类 号：O413.1[理学—理论物理] TN610.4[理学—物理]