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）
Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China Research Institute of Information Science, Huaihua University, Huaihua 418008, China
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.
Received: 18 June 2006
Revised: 21 October 2006
Accepted manuscript online:
Fund: Project supported by Hunan Provincial
Natural Science Foundation of China (Grant No~06jj50014).
Cite this article:
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） Multipartite entanglement in the interaction system between a single-mode microwave cavity field and superconducting charge qubits 2007 Chinese Physics 16 1615
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