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We study the entanglement of the superconducting charge qubit with thequantized electromagnetic field in a microwave cavity. It can be controlleddynamically by a classical external field threading the SQUID within the chargequbit. Utilizing the controllable quantum entanglement, we can demonstrate thedynamic process of the quantum storage of information carried by charge qubit.On the other hand, based on this engineered quantum entanglement, we can alsodemonstrate a progressive decoherence of charge qubit with quantum jump due tothe coupling with the cavity field in quasi-classical state.Comment: 6 pages, 4 figure

Charge Qubit Storage and Its Engineered Decoherence via Microwave Cavity