Implementing ancilla-free phase covariant quantum cloning with atoms trapped in cavities

摘要：

We propose a scheme to implement ancilla-free 1 to 2 optimal phase covariant quantum cloning with atoms trapped in cavities. In the scheme the W-class state of three atoms, which are individually trapped in three spatially separated cavities, is deterministically generated. Then by the use of this Wclass state and detection of the atomic state, an optimal ancilla-free 1 to 2 phase-covariant quantum cloning between two spatially separated trapped atoms can be realized. The scheme is robust for atomic spontaneous decay, cavity decay and photon leakage out of the fiber. In principle, an M+l-atom W-class state can be generated by using such an approach. Thus this scheme also can be generalized to implement 1 to M ancilla-free phase-covariant quantum cloning.

关键词： ancilla-free 1 to 2 optimal phase covariant quantum cloning, atoms trapped in cavities

作者: YE Liu XIONG Wei LI AiXia GUO GuangCan

作者单位: Anhui Key Laboratory of Information Material & Devices, School of Physics & Material Science, Anhui Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, Chin

会议类型: 国际会议

会议名称: 原子核磁矩国际研讨会

会议地点: 北京

会议语种:英文

页码: 262-267

在线出版日期: 2010-04-27（万方平台首次上网日期，不代表论文的发表时间）