Realization of a general quantum cloning machine via cavity-assisted interaction
Key Laboratory of Opto-electronic Information Acquisition and Manipulation, Anhui University Hefei, 230039, China
2 Department of Mathematics & Physics, Hefei University - Hefei, 230022, China
3 School of Physics & Electronics Science, Fu Yang Teachers College - Fuyang, 236037, China
Accepted: 14 February 2012
We present a scheme to realize a general quantum cloning machine via cavity-assisted interaction. First, this scheme can prepare entangled states of three remote trapped atoms including the W state and the GHZ state. Based on this approach, the quantum information carried by a photon pulse or a trapped atom can be copied to other two trapped atoms. According to the known information of the initial state, the equipment can provide the optimal symmetric (asymmetric) universal and phase-covariant quantum cloning. Further, via the cavity input-output process, the quantum cloning can be realized with high fidelity, even if the atom is not localized in the Lamb-Dicke regime.
PACS: 03.67.-a – Quantum information / 03.67.Lx – Quantum computation architectures and implementations / 42.50.Pq – Cavity quantum electrodynamics; micromasers
© EPLA, 2012