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Chin. Phys. B, 2014, Vol. 23(4): 040307    DOI: 10.1088/1674-1056/23/4/040307
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Preparation of multi-photon Fock states and quantum entanglement properties in circuit QED

Ji Ying-Huaa b, Hu Ju-Jua b
a Department of Physics, Jiangxi Normal University, Nanchang 330022, China;
b Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang 330022, China
Abstract  We demonstrate the controllable generation of multi-photon Fock states in circuit quantum electrodynamics (circuit QED). The external bias flux regulated by a counter can effectively adjust the bias time on each superconducting flux qubit so that each flux qubit can pass in turn through the circuit cavity and thereby avoid the effect of decoherence. We further investigate the quantum correlation dynamics of coupling superconducting qubits in a Fock state. The results reveal that the lower the photon number of the light field in the number state, the stronger the interaction between qubits is, then the more beneficial to maintaining entanglement between qubits it will be.
Keywords:  circuit quantum electrodynamics      multi-photon Fock state      preparation of quantum state      concurrence  
Received:  09 July 2013      Revised:  30 September 2013      Accepted manuscript online: 
PACS:  03.65.Ta (Foundations of quantum mechanics; measurement theory)  
  03.65.Ud (Entanglement and quantum nonlocality)  
  03.67.-a (Quantum information)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11264015).
Corresponding Authors:  Hu Ju-Ju     E-mail:  ahmxhxtt@aliyun.com
About author:  03.65.Ta; 03.65.Ud; 03.67.-a

Cite this article: 

Ji Ying-Hua, Hu Ju-Ju Preparation of multi-photon Fock states and quantum entanglement properties in circuit QED 2014 Chin. Phys. B 23 040307

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