Generation of various multiatom entangled graph states via resonant interactions  

作　　者：董萍 章礼华 曹卓良 

机构地区：[1]Key Laboratory of Opto-electronic Information Acquisition and Manipulation, Ministry of Education, School of Physics & Material Science, Anhui University [2]Department of Physics, Anqing Teachers College [3]The School of Science, Hangzhou Dianzi University

出　　处：《Chinese Physics B》2008年第6期1979-1984,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos 60678022 and 10704001);the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No 20060357008);Anhui Provincial Natural Science Foundation, China (Grant No 070412060);the Key Program of the Education Department of Anhui Province, China (Grant Nos KJ2008A28ZC, KJ2008B83ZC, KJ2008B265 and KJ2007B082);the Talent Foundation of Anhui University, China,and the Anhui Key Laboratory of Information Materials and Devices (Anhui University), China

摘　　要：In this paper, a scheme for generating various multiatom entangled graph states via resonant interactions is proposed. We investigate the generation of various four-atom graph states first in the ideal case and then in the case in which the cavity decay and atomic spontaneous emission are taken into consideration in the process of interaction. More importantly, we improve the possible distortion of the graph states coming from cavity decay and atomic spontaneous emission by performing appropriate unitary transforms on atoms. The generation of multiatom entangled graph states is very important for constructing quantum one-way computer in a fault-tolerant manner. The resonant interaction time is very short, which is important in the sense of decoherence. Our scheme is easy and feasible within the reach of current experimental technology.In this paper, a scheme for generating various multiatom entangled graph states via resonant interactions is proposed. We investigate the generation of various four-atom graph states first in the ideal case and then in the case in which the cavity decay and atomic spontaneous emission are taken into consideration in the process of interaction. More importantly, we improve the possible distortion of the graph states coming from cavity decay and atomic spontaneous emission by performing appropriate unitary transforms on atoms. The generation of multiatom entangled graph states is very important for constructing quantum one-way computer in a fault-tolerant manner. The resonant interaction time is very short, which is important in the sense of decoherence. Our scheme is easy and feasible within the reach of current experimental technology.

关 键 词：graph state resonant interaction cavity decay spontaneous emission 

分 类 号：O413.1[理学—理论物理]