中国物理B ›› 2007, Vol. 16 ›› Issue (6): 1615-1618.doi: 10.1088/1009-1963/16/6/021

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Multipartite entanglement in the interaction system between a single-mode microwave cavity field and superconducting charge qubits

施振刚, 谌雄文, 朱喜香, 宋克慧   

  1. Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China Research Institute of Information Science, Huaihua University, Huaihua, 418008, China
  • 收稿日期:2006-06-18 修回日期:2006-10-21 出版日期:2007-06-20 发布日期:2007-06-20
  • 基金资助:
    Project supported by Hunan Provincial Natural Science Foundation of China (Grant No~06jj50014).

Multipartite entanglement in the interaction system between a single-mode microwave cavity field and superconducting charge qubits

Shi Zhen-Gang(施振刚)†, Chen Xiong-Wen(谌雄文）, Zhu Xi-Xiang(朱喜香）, and Song Ke-Hui(宋克慧）   

  1. Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China Research Institute of Information Science, Huaihua University, Huaihua 418008, China
  • Received:2006-06-18 Revised:2006-10-21 Online:2007-06-20 Published:2007-06-20
  • Supported by:
    Project supported by Hunan Provincial Natural Science Foundation of China (Grant No~06jj50014).

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摘要： This paper proposes a method of generating multipartite entanglement through using d.c. superconducting quantum interference devices (SQUID) inside a standing wave cavity. In this scheme, the d.c. SQUID works in the charge region. It is shown that, a large number of important multipartite entangled states can be generated by a controllable interaction between a cavity field and qubits. It is even possible to produce entangled states involving different cavity modes based on the measurement of charge qubits states. After such superpositions states are created, the interaction can be switched off by the classical magnetic field through the SQUID, and there is no information transfer between the cavity field and the charge qubits.

关键词: superconducting charge qubits, standing wave cavity, Schr?dinger cat states, superpositions of mesoscopic quantum states

Abstract: This paper proposes a method of generating multipartite entanglement through using d.c. superconducting quantum interference devices (SQUID) inside a standing wave cavity. In this scheme, the d.c. SQUID works in the charge region. It is shown that, a large number of important multipartite entangled states can be generated by a controllable interaction between a cavity field and qubits. It is even possible to produce entangled states involving different cavity modes based on the measurement of charge qubits states. After such superpositions states are created, the interaction can be switched off by the classical magnetic field through the SQUID, and there is no information transfer between the cavity field and the charge qubits.

Key words: superconducting charge qubits, standing wave cavity, Schr?dinger cat states, superpositions of mesoscopic quantum states

中图分类号:  (Quantum state engineering and measurements)

  • 42.50.Dv
42.50.Pq (Cavity quantum electrodynamics; micromasers)