Structure formation of entanglement entropy in a system of two superconducting qubits coupled with an LC-resonator

doi:10.1088/1674-1056/20/8/080304

Abstract This paper investigates theoretically the evolutions of the entanglement entropy of a system of two coupled-charge-qubits interacting with an LC-resonator. It is found that when the initial states of the two qubits are prepared in a given superposition excited state, the evolution of the von Neumann entropy of the system depends significantly on the coupling strength between the two Josephson charge qubits. With the variation of the coupling strength, the evolution of the entanglement entropy of the system forms some structures, especially the periodically bistable properties, which are the first discovered for such a system to our knowledge. It is found that the relative entropy entanglement of the system is also sensitive to the variation of the coupling strength between the two charge qubits, some novel 'collective oscillations' of the relative entropy are found for the system.

Keywords: superconducting quantum circuits evolutions of entanglement entropy structure formation

Received: 25 January 2011
Revised: 03 March 2011
Accepted manuscript online:

PACS:	03.67.-a	(Quantum information)
	03.65.Ud	(Entanglement and quantum nonlocality)
	42.50.-p	(Quantum optics)

Fund: Project supported by the China “State 973 Project” (Grant No. 2006CB921606), the Natural Science Foundation of Hubei Province of China, and the Innovation Fund of Huazhong University of Science and Technology (2010).

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Ge Guo-Qin(葛国勤), Qin Cui(覃翠), Yin Miao(尹淼), and Huang Yong-Hua(黄勇华) Structure formation of entanglement entropy in a system of two superconducting qubits coupled with an LC-resonator 2011 Chin. Phys. B 20 080304

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Structure formation of entanglement entropy in a system of two superconducting qubits coupled with an LC-resonator

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