Decoherence-immune generation of highly entangled states for two atoms  

作　　者：郑仕标 

机构地区：[1]Department of Physics and State Key Laboratory Breeding Base of Photocatalysis,Fuzhou University

出　　处：《Chinese Physics B》2010年第4期273-277,共5页中国物理B（英文版）

基　　金：Project supported by funds from the State Key Laboratory Breeding Base of Photocatalysis,Fuzhou University

摘　　要：This paper proposes a decoherence-immune scheme for generating highly entangled states for two atoms trapped in a cavity. The scheme is based on two resonant atom-cavity interactions. Conditional upon the detection of no photon, the two atoms may exchange an excitation via the first resonant interaction, which leads to entanglement. Due to the loss of the excitation, the two atoms are in a mixed entangled state. With the help of an auxiliary ground state not coupled to the cavity mode, the state related to the excitation loss is eliminated by the detection of a photon resulting from the second resonant interaction. Thus, the fidelity of entanglement is almost not affected by the decoherence.This paper proposes a decoherence-immune scheme for generating highly entangled states for two atoms trapped in a cavity. The scheme is based on two resonant atom-cavity interactions. Conditional upon the detection of no photon, the two atoms may exchange an excitation via the first resonant interaction, which leads to entanglement. Due to the loss of the excitation, the two atoms are in a mixed entangled state. With the help of an auxiliary ground state not coupled to the cavity mode, the state related to the excitation loss is eliminated by the detection of a photon resulting from the second resonant interaction. Thus, the fidelity of entanglement is almost not affected by the decoherence.

关 键 词：entangled state resonant interaction auxiliary ground state 

分 类 号：O431.2[机械工程—光学工程] S858.312.5[理学—光学]