  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.

Quantum Physics