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Linear Entropy and Entanglement in Two-Charge-Qubit Circuits |
LIAO Qing-Hong1, FANG Guang-Yu1, WANG Yue-Yuan1,2, AHMAD Muhammad Ashfaq3, LIU Shu-Tian1 |
| 1Department of Physics, Harbin Institute of Technology, Harbin 150001 2Key Laboratory for Advanced Functional Materials and Excited State Process of Heilongjiang Province, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025 3Department of Physics, COMSATS Institute of Information Technology, Lahore 54000, Pakistan |
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| Cite this article: |
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LIAO Qing-Hong, FANG Guang-Yu, WANG Yue-Yuan et al 2010 Chin. Phys. Lett. 27 070304 |
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Abstract We consider a model that contains two coupled superconducting charge qubits by sharing a large Josephson junction. We examine the dynamical properties of the linear entropy of two qubits and the probability of both qubits being in an excited state. The results show that the initial mean photon number, the initial phase of the field and the relative phase of the two qubits' levels play an important role in the evolution of the linear entropy of the two qubits and the probability.
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| Keywords:
03.65.Ud
89.70.Cf
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Received: 29 October 2009
Published: 28 June 2010
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| PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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89.70.Cf
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(Entropy and other measures of information)
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