摘要：We study the entanglement of the superconducting charge qubit with the quantized electromagnetic field in a microwave cavity. It can be controlled dynamically by a classical external field threading the SQUID within the charge qubit. Utilizing the controllable quantum entanglement, we can demonstrate the dynamic process of the quantum storage of information carried by charge qubit. On the other hand, based on this engineered quantum entanglement, we can also demonstrate a progressive decoherence of charge cubit with quantum jump due to the coupling with the cavity field in quasi-classical state.

摘要：Known as an engineered reservoir due to fluctuations in trap parameter,a classical source of quantum decoherence is considered for a single trapped ion *** simplicity it is assumed that the fluctuations involved are white noise processes,which enables us to give a simple master equation description of this source of *** results show that the decoherence rate depends on the vibrational quantum number in different ways corresponding to the vibrational excitation sideband used ***,this source of decoherence also leads to occurrence of dissipation in the ion system.