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

作　　者：施振刚 谌雄文 朱喜香 宋克慧 

机构地区：[1]Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China Research Institute of Information Science, Huaihua University, Huaihua, 418008, China

出　　处：《Chinese Physics B》2007年第6期1615-1618,共4页中国物理B（英文版）

基　　金：Project supported by Hunan Provincial Natural Science Foundation of China （Grant No 06jj50014）.

摘　　要：This paper proposes a method of generating multipartite entanglement through using d.c. superconducting quan- tum 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.This paper proposes a method of generating multipartite entanglement through using d.c. superconducting quan- tum 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 Schrodinger cat states superpositions of mesoscopic quantum states 

分 类 号：O413[理学—理论物理]