Conditional implementation of asymmetrical universal quantum cloning machine

Radim Filip

备注：: 5 pages, 3 figures, accepted for pulication in PRA
DOI：: 10.1103/PhysRevA.69.032309

英文摘要：

We propose two feasible experimental implementations of an optimal asymmetric 1->2 quantum cloning of a polarization state of photon. Both implementations are based on a partial and optimal reverse of recent conditional symmetrical quantum cloning experiments. The reversion procedure is performed only by a local measurement of one from the clones and ancilla followed by a local operation on the other clone. The local measurement consists only of a single unbalanced beam splitter followed in one output by a single photon detector and the asymmetry of fidelities in the cloning is controlled by a reflectivity of the beam splitter.

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