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

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 Neuman...

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Bibliographic Details
Published in:Chinese physics B 2011-08, Vol.20 (8), p.39-46, Article 080304
Main Authors: Ge, Guo-Qin, Qin, Cui, Yin, Miao, Huang, Yong-Hua
Format: Article
Language:English
Subjects:
Charge
Entanglement
Entropy
Evolution
Joining
Qubits (quantum computing)
Strength
Superconductivity
构形
相对熵
系统
纠缠
谐振器
超导
量子比特
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Summary: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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/8/080304