Realization of superposition and entanglement of coherent and squeezed states in circuit quantum electrodynamics  

作　　者：CHEN ChangYong SUN Qing 

机构地区：[1]Department of Physics and Information Engineering, Hunan Institute of Humanities, Science and Technology, Loudi 417000, China [2]Beijing National Laboratory for Condensated Matter Physics, Chinese Academy of Sciences, Beijing 100190, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第5期930-935,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation ofChina (Grant Nos. 11074070, 10774042, 10874235, 10934010, 60978019,10775176, 60525417, and 10774163);the Natural Science Foundation ofHunan Province (Grant No. 09JJ3121);the Key Project of Science andTechnology of Hunan Province (Grant No. 2010FJ2005);the NKBRSFC(Grants Nos. 2006CB921400, 2009CB930704 and 2010CB922904)

摘　　要：We propose a new scheme for generating the superposition and entanglement of the coherent states and squeezed states by consid- ering N superconducting charge qubits （or artificial two-level atoms） interacting with photons in a high finesse cavity on a chip, assisted by a strong driving field. By virtue of the parameters of this system, we can generate novel quantum states, for example, multiparty entangled states and Schr6dinger cat states among the superconducting qubits, coherent states and squeezed states of the cavity. These states, whose amplitudes are about two orders greater than those from the atomic quantum electrodynamics in classical cavity, are important for understanding the boundary between quantum and classical behavior and can be utilized in experimental studies on decoherence. This device may be an architecture for future solid-state quantum computation and communication.We propose a new scheme for generating the superposition and entanglement of the coherent states and squeezed states by considering N superconducting charge qubits (or artificial two-level atoms) interacting with photons in a high finesse cavity on a chip, assisted by a strong driving field. By virtue of the parameters of this system, we can generate novel quantum states, for example, multiparty entangled states and Schro¨dinger cat states among the superconducting qubits, coherent states and squeezed states of the cavity. These states, whose amplitudes are about two orders greater than those from the atomic quantum electrodynamics in classical cavity, are important for understanding the boundary between quantum and classical behavior and can be utilized in experimental studies on decoherence. This device may be an architecture for future solid-state quantum computation and communication.

关 键 词：multiparty entangmement circuit QED photon interaction 

分 类 号：O413.2[理学—理论物理] O436.1[理学—物理]