中国物理B ›› 2009, Vol. 18 ›› Issue (4): 1352-1356.doi: 10.1088/1674-1056/18/4/011

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Quantum logic gates with two-level trapped ions beyond Lamb--Dicke limit

蔡建武1, 郑小娟2, 罗益民3   

  1. (1)Department of Physics, Hunan Industrial University, Zhuzhou 412000, China; (2)School of Material Science and Engineering, Central South University, Changsha 410083, China;School of Physics Science and Technology, Central South University, Changsha 410083, China; (3)School of Physics Science and Technology, Central South University, Changsha 410083, China
  • 收稿日期:2008-07-05 修回日期:2008-08-29 出版日期:2009-04-20 发布日期:2009-04-20
  • 基金资助:
    Project supported by the Important Program of Hunan Provincial Education Department (Grant No 06A038), Department of Education of Hunan Province (Grant No 06C080), Natural Science Foundation of Hunan Province, China (Grant No 07JJ3013), and Postdoctoral F

Quantum logic gates with two-level trapped ions beyond Lamb--Dicke limit

Zheng Xiao-Juan(郑小娟)a)b), Luo Yi-Min(罗益民)b), and Cai Jian-Wu(蔡建武)c)   

  1. a School of Material Science and Engineering, Central South University, Changsha 410083, China; b School of Physics Science and Technology, Central South University, Changsha 410083, China; c Department of Physics, Hunan Industrial University, Zhuzhou 412000, China
  • Received:2008-07-05 Revised:2008-08-29 Online:2009-04-20 Published:2009-04-20
  • Supported by:
    Project supported by the Important Program of Hunan Provincial Education Department (Grant No 06A038), Department of Education of Hunan Province (Grant No 06C080), Natural Science Foundation of Hunan Province, China (Grant No 07JJ3013), and Postdoctoral F

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摘要： In the system with two two-level ions confined in a linear trap, this paper presents a simple scheme to realize the quantum phase gate (QPG) and the swap gate beyond the Lamb--Dicke (LD) limit. These two-qubit quantum logic gates only involve the internal states of two trapped ions. The scheme does not use the vibrational mode as the data bus and only requires a single resonant interaction of the ions with the lasers. Neither the LD approximation nor the auxiliary atomic level is needed in the proposed scheme. Thus the scheme is simple and the interaction time is very short, which is important in view of decoherence. The experimental feasibility for achieving this scheme is also discussed.

关键词: trapped ions, quantum phase gate, swap gate, beyond the Lamb--Dicke limit

Abstract: In the system with two two-level ions confined in a linear trap, this paper presents a simple scheme to realize the quantum phase gate (QPG) and the swap gate beyond the Lamb--Dicke (LD) limit. These two-qubit quantum logic gates only involve the internal states of two trapped ions. The scheme does not use the vibrational mode as the data bus and only requires a single resonant interaction of the ions with the lasers. Neither the LD approximation nor the auxiliary atomic level is needed in the proposed scheme. Thus the scheme is simple and the interaction time is very short, which is important in view of decoherence. The experimental feasibility for achieving this scheme is also discussed.

Key words: trapped ions, quantum phase gate, swap gate, beyond the Lamb--Dicke limit

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

  • 03.67.Lx
84.30.Sk (Pulse and digital circuits) 03.65.Ud (Entanglement and quantum nonlocality)