Screening Effect in Charge Qubit |
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Authors: | HUA Ming XIAO Xiao GAO Yi-Bo |
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Affiliation: | College of Applied Sciences, Beijing University of Technology, Beijing 100124, China |
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Abstract: | We study the influence of screening effect on quantum decoherence for charge qubit and the process of quantum information storage. When the flux produced by the circulating current in SQUID loop is considered, screening effect is formally characterized by a LC resonator. Using large-detuning condition and Fröhlich transformation in the qubit-cavity-resonator system, we calculate the decoherence factor for charge qubit and the effective qubit-cavity Hamiltonian. The decoherence factor owns a factorized structure, it shows that screening effect is a resource of decoherence for charge qubit. The effective Hamiltonian shows that the screening effect results in a frequency shift for charge qubit and a modified qubit-cavity coupling constant induced by a LC resonator. |
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Keywords: | charge qubit quantum decoherence quantum information storage cavity QED |
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