An experimentally feasible scheme for teleportation of an arbitrary unknown entangled state is proposed. Our scheme is based on Josephson charge qubits, where we do not need any joint measurement. Moreover the success...An experimentally feasible scheme for teleportation of an arbitrary unknown entangled state is proposed. Our scheme is based on Josephson charge qubits, where we do not need any joint measurement. Moreover the successful probability and fidelity of the teleportation can both reach 1.0. The current scheme can be realized within the current experimental technology.展开更多
A type of two qubits Josephson charge system is constructed, and properties of the quantum discord （QD） as well as the differences between thermal QD and thermal entanglement are investigated. A detailed calculation...A type of two qubits Josephson charge system is constructed, and properties of the quantum discord （QD） as well as the differences between thermal QD and thermal entanglement are investigated. A detailed calculation shows that the magnetic flux is more efficient than the voltage in tuning QD. By choosing proper system parameter the maximum QD can be realized in our two qubits Josephson charge system.展开更多
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 master equation from a JCQ-bath model.Then we investigate the...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 master equation from a JCQ-bath model.Then we investigate thecoefficients of the equations that describe the shift in frequency,diffusive,decoherence,and so on.It is shown that ourresult on decoherence agrees with experimental one very well as the time is short enough.展开更多
基金The project supported partly by National Natural Science Foundation of China under Grant Nos.60678022 and 10674001Natural Science Foundation of Anhui Province under Grant No.070412060+3 种基金the Doctoral Fund of Ministry of Education of China under Grant No.20060357008the Key Program of the Education Department of Anhui Province under Grant No.2006KJ070Athe Program of the Education Department of Anhui Province under Grant No.2006KJ057Bthe Talent Foundation of Anhui University,Anhui Key Laboratory of Information Materials and Devices(Anhui University)
文摘An experimentally feasible scheme for teleportation of an arbitrary unknown entangled state is proposed. Our scheme is based on Josephson charge qubits, where we do not need any joint measurement. Moreover the successful probability and fidelity of the teleportation can both reach 1.0. The current scheme can be realized within the current experimental technology.
文摘A type of two qubits Josephson charge system is constructed, and properties of the quantum discord （QD） as well as the differences between thermal QD and thermal entanglement are investigated. A detailed calculation shows that the magnetic flux is more efficient than the voltage in tuning QD. By choosing proper system parameter the maximum QD can be realized in our two qubits Josephson charge system.
基金National Natural Science Foundation of China under Grant No.10675066K.C.Wong Magna Foundation in Ningbo University
文摘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 master equation from a JCQ-bath model.Then we investigate thecoefficients of the equations that describe the shift in frequency,diffusive,decoherence,and so on.It is shown that ourresult on decoherence agrees with experimental one very well as the time is short enough.
