中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5161-5167.doi: 10.1088/1674-1056/18/12/011

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

邵晓强1, 赵永芳1, 张寿2, 陈丽3   

  1. (1)Centre for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China; (2)Centre for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, College of Science, Yanbian University, Yanji 133002, China; (3)Department of Physics, College of Science, Yanbian University, Yanji 133002, China
  • 收稿日期:2009-04-21 修回日期:2009-05-14 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60667001).

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

Shao Xiao-Qiang(邵晓强)a), Chen Li(陈丽)b), Zhang Shou(张寿)a)b)†, and Zhao Yong-Fang(赵永芳)a)   

  1. a Centre for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China; b Department of Physics, College of Science, Yanbian University, Yanji 133002, China
  • Received:2009-04-21 Revised:2009-05-14 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60667001).

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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.

Abstract: 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.

Key words: decoherence-free subspaces, cavity quantum electrodynamics

中图分类号:  (Quantum computation architectures and implementations)

  • 03.67.Lx
42.50.Pq (Cavity quantum electrodynamics; micromasers) 85.25.Dq (Superconducting quantum interference devices (SQUIDs))