One-step implementing three-qubit phase gate via manipulating rf SQUID qubits in the decoherence-free subspace with respect to cavity decay  

作　　者：邵晓强 陈丽 张寿 赵永芳 

机构地区：[1]Centre for the Condensed-Matter Science and Technology,Harbin Institute of Technology [2]Department of Physics,College of Science,Yanbian University

出　　处：《Chinese Physics B》2009年第12期5161-5167,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No 60667001)

摘　　要：We present a scheme for implementing a three-qubit phase gate via manipulating rf superconducting quantum interference device （SQUID） qubits in the decoherence-free subspace with respect to cavity decay. Through appropriate changes of the coupling constants between rf SQUIDs and cavity, the scheme can be realized only in one step. A high fidelity is obtained even in the presence of decoherence.We present a scheme for implementing a three-qubit phase gate via manipulating rf superconducting quantum interference device （SQUID） qubits in the decoherence-free subspace with respect to cavity decay. Through appropriate changes of the coupling constants between rf SQUIDs and cavity, the scheme can be realized only in one step. A high fidelity is obtained even in the presence of decoherence.

关 键 词：decoherence-free subspaces cavity quantum electrodynamics 

分 类 号：O413.1[理学—理论物理]