Preparation of the four-qubit cluster states in cavity QED and the trapped-ion system  

作　　者：郑小娟 徐慧 方卯发 朱开成 

机构地区：[1]School of Material Science and Engineering,Central South University [2]School of Physics Science and Technology,Central South University [3]College of Physics and Information Science,Hunan Normal University

出　　处：《Chinese Physics B》2010年第3期338-342,共5页中国物理B（英文版）

基　　金：Project supported by the Postdoctal Foundation of Central South University of China;the Important Program of Hunan Provincial Education Department of China (Grant No. 06A038);Department of Education of Hunan Province of China (Grant No. 06C080);Hunan Provincial Natural Science Foundation,China (Grant No. 07JJ3013)

摘　　要：This paper proposes a simple scheme to generate a four-atom entangled cluster state in cavity quantum electrodynamics. With the assistantce of a strong classical field the cavity is only virtually excited and no quantum information will be transferred from the atoms to the cavity during the preparation for a four-atom entangled cluster state, and thus the scheme is insensitive to the cavity field states and cavity decay. Assuming that deviation of laser intensity is 0.01 and that of simultaneity for the interaction is 0.01, it shows that the fidelity of the resulting four-atom entangled cluster state is about 0.9886. The scheme can also be used to generate a four-ion entangled cluster state in a hot trapped-ion system. Assuming that deviation of laser intensity is 0.01, it shows that the fidelity of the resulting four-ion entangled cluster state is about 0.9990. Experimental feasibility for achieving this scheme is also discussed.This paper proposes a simple scheme to generate a four-atom entangled cluster state in cavity quantum electrodynamics. With the assistantce of a strong classical field the cavity is only virtually excited and no quantum information will be transferred from the atoms to the cavity during the preparation for a four-atom entangled cluster state, and thus the scheme is insensitive to the cavity field states and cavity decay. Assuming that deviation of laser intensity is 0.01 and that of simultaneity for the interaction is 0.01, it shows that the fidelity of the resulting four-atom entangled cluster state is about 0.9886. The scheme can also be used to generate a four-ion entangled cluster state in a hot trapped-ion system. Assuming that deviation of laser intensity is 0.01, it shows that the fidelity of the resulting four-ion entangled cluster state is about 0.9990. Experimental feasibility for achieving this scheme is also discussed.

关 键 词：cavity quantum electrodynamics （QED） trapped ions cluster state 

分 类 号：O431.2[机械工程—光学工程] O562[理学—光学]