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

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

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.

Keywords: circuit QED preparation of quantum state entangled coherent state concurrence

Received: 30 March 2014
Revised: 28 April 2014
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: Ji Ying-Hua
E-mail: ahmxhxtt@aliyun.com

Cite this article:

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

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