摘要
We propose a scheme for sharing an arbitrary unknown two-qubit state among three parties by using afour-qubit cluster-class state and a Bell state as a quantum channel With a quantum controlled phase gate (QCPG)operation and a local unitary operation,any one of the two agents has the access to reconstruct the original state ifhe/she collaborates with the other one,whilst individual agent obtains no information.As all quantum resource canbe used to carry the useful information,the intrinsic efficiency of qubits approaches the maximal value.Moreover,thepresent scheme is more feasible with present-day technique.
We propose a scheme for sharing an arbitrary unknown two-qubit state among three parties by using a four-qubit cluster-class state and a Bell state as a quantum channel. With a quantum controlled phase gate （QCPG） operation and a local unitary operation, any one of the two agents has the access to reconstruct the original state if he/she collaborates with the other one, whilst individual agent obtains no information. As all quantum resource can be used to carry the useful information, the intrinsic efficiency of qubits approaches the maximal value. Moreover, the present scheme is more feasible with present-day technique.
基金
Supported by the Natural Science Research Programme of the Education Department of Anhui Province under Grant Nos.KJ2009B039Z and KJ2009B018Z
the Municipal Level Research Project from Lu'an City directive entrusted to West AnHui University under Grant No.2008LW004
关键词
量子位
纠缠交换
共享
贝尔
测量基
量子态
量子比特
量子通道
quantum state sharing, entanglement swapping, Bell-state measurements, QCPG operation, local unitary operation
