Controllable preparation of two-mode entangled coherent states in circuit QED

doi:10.1088/1674-1056/23/11/110303

›› 2014, Vol. 23 ›› Issue (11): 110303-110303.doi: 10.1088/1674-1056/23/11/110303

Controllable preparation of two-mode entangled coherent states in circuit QED

嵇英华^{a b}, 刘咏梅^c

a Department of Physics, Jiangxi Normal University, Nanchang 330022, China;
b Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang 330022, China;
c College of Mathematics and Information Science, Jiangxi Normal University, Nanchang 330022, China

收稿日期:2014-03-30 修回日期:2014-04-28 出版日期:2014-11-15 发布日期:2014-11-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11264015).

Controllable preparation of two-mode entangled coherent states in circuit QED

Ji Ying-Hua (嵇英华)^{a b}, Liu Yong-Mei (刘咏梅)^c

a Department of Physics, Jiangxi Normal University, Nanchang 330022, China;
b Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang 330022, China;
c College of Mathematics and Information Science, Jiangxi Normal University, Nanchang 330022, China

Received:2014-03-30 Revised:2014-04-28 Online:2014-11-15 Published:2014-11-15
Contact: Ji Ying-Hua E-mail:ahmxhxtt@aliyun.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11264015).

摘要/Abstract

摘要： Although the multi-level structure of superconducting qubits may result in calculation errors, it can be rationally used to effectively improve the speed of gate operations. Utilizing a current-biased Josephson junction (Λ-type rf-SQUID) as a tunable coupler for superconducting transmission line resonators (TLRs), under the large detuning condition, we demonstrate the controllable generation of entangled coherent states in circuit quantum electrodynamics (circuit QED). The coupling between the TLRs and the qubit can be effectively regulated by an external bias current or coupling capacitor. Further investigations indicate that the maximum entangled state can be obtained through measuring the excited state of the superconducting qubits. Then, the influence of the TLR decay on the prepared entangled states is analyzed.

关键词: circuit QED, preparation of quantum state, entangled coherent state, concurrence

Abstract: Although the multi-level structure of superconducting qubits may result in calculation errors, it can be rationally used to effectively improve the speed of gate operations. Utilizing a current-biased Josephson junction (Λ-type rf-SQUID) as a tunable coupler for superconducting transmission line resonators (TLRs), under the large detuning condition, we demonstrate the controllable generation of entangled coherent states in circuit quantum electrodynamics (circuit QED). The coupling between the TLRs and the qubit can be effectively regulated by an external bias current or coupling capacitor. Further investigations indicate that the maximum entangled state can be obtained through measuring the excited state of the superconducting qubits. Then, the influence of the TLR decay on the prepared entangled states is analyzed.

Key words: circuit QED, preparation of quantum state, entangled coherent 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, 刘咏梅. Controllable preparation of two-mode entangled coherent states in circuit QED[J]. , 2014, 23(11): 110303-110303.

Ji Ying-Hua (嵇英华), Liu Yong-Mei (刘咏梅). Controllable preparation of two-mode entangled coherent states in circuit QED[J]. Chin. Phys. B, 2014, 23(11): 110303-110303.

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Controllable preparation of two-mode entangled coherent states in circuit QED

Controllable preparation of two-mode entangled coherent states in circuit QED

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