<正> In this paper we investigate an environmental effects to Josephson charge qubit (JCQ) when the environmentis taken as the Ohmic bath.At first,we derive the
<正> We present a scheme for quantum secure direct communication,in which the message is encoded bylocal unitary operations,transmitted through entangled photon
<正> We report a theoretic study on modulating the spin polarization of charge current in a mesoscopic four-terminaldevice of cross structure by using the inver
<正> The ground-state and lowest excited-state binding energies of a hydrogenic impurity in GaAs parabolicquantum-well wires(QWWs)subjected to external electric