Entanglement Dynamics of Two Qubits Coupled Independently to Cavities in the Ultrastrong Coupling Regime: Analytical Results
Wei-Ting Zhu1 , Qing-Bao Ren1** , Li-Wei Duan2 , Qing-Hu Chen2,3**
1 College of Engineering and Design, Lishui University, Lishui 3230002 Department of Physics, Zhejiang University, Hangzhou 3100273 Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093
Abstract ：Dynamics of quantum entanglement of two qubits in two identical quantum Rabi models is studied analytically in the framework of corrections to the rotating-wave approximations. A closed-form expression for the entanglement dynamics initiated from the well-known Bell states is derived, which is very close to the numerical exact results up to the ultrastrong coupling regime. It is found that the vanishing entanglement can be purely induced by the counter-rotating terms, and can be enhanced with the atom–cavity coupling.
收稿日期: 2016-01-17
出版日期: 2016-05-31
:
03.65.Ud
(Entanglement and quantum nonlocality)
03.65.Yz
(Decoherence; open systems; quantum statistical methods)
42.50.Ct
(Quantum description of interaction of light and matter; related experiments)
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2016, Vol. 33 
