Preparation of multi-photon Fock states and quantum entanglement properties in circuit QED

doi:10.1088/1674-1056/23/4/040307

中国物理B ›› 2014, Vol. 23 ›› Issue (4): 40307-040307.doi: 10.1088/1674-1056/23/4/040307

Preparation of multi-photon Fock states and quantum entanglement properties in circuit QED

嵇英华^{a b}, 胡菊菊^{a b}

a Department of Physics, Jiangxi Normal University, Nanchang 330022, China;
b Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang 330022, China

收稿日期:2013-07-09 修回日期:2013-09-30 出版日期:2014-04-15 发布日期:2014-04-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11264015).

Preparation of multi-photon Fock states and quantum entanglement properties in circuit QED

Ji Ying-Hua (嵇英华)^{a b}, Hu Ju-Ju (胡菊菊)^{a b}

a Department of Physics, Jiangxi Normal University, Nanchang 330022, China;
b Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang 330022, China

Received:2013-07-09 Revised:2013-09-30 Online:2014-04-15 Published:2014-04-15
Contact: Hu Ju-Ju E-mail:ahmxhxtt@aliyun.com
About author:03.65.Ta; 03.65.Ud; 03.67.-a
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11264015).

摘要/Abstract

摘要： 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.

关键词: circuit quantum electrodynamics, multi-photon Fock state, preparation of quantum state, concurrence

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.

Key words: circuit quantum electrodynamics, multi-photon Fock state, preparation of quantum state, concurrence

中图分类号: (Foundations of quantum mechanics; measurement theory)

03.65.Ta

03.65.Ud (Entanglement and quantum nonlocality) 03.67.-a (Quantum information)

嵇英华, 胡菊菊. Preparation of multi-photon Fock states and quantum entanglement properties in circuit QED[J]. 中国物理B, 2014, 23(4): 40307-040307.

Ji Ying-Hua (嵇英华), Hu Ju-Ju (胡菊菊). Preparation of multi-photon Fock states and quantum entanglement properties in circuit QED[J]. Chin. Phys. B, 2014, 23(4): 40307-040307.

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Preparation of multi-photon Fock states and quantum entanglement properties in circuit QED

Preparation of multi-photon Fock states and quantum entanglement properties in circuit QED

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