Highly asymmetric quantum cloning in arbitrary dimension
Jaromı́r Fiurášek, Radim Filip, Nicolas J. Cerf · CERN Document Server (European Organization for Nuclear Research) · 2005
We investigate the universal asymmetric cloning of states in a Hilbert space of arbitrary dimension. We derive the class of optimal and fully asymmetric 1->3 cloners, which produce three copies, each having a different fidelity. A simple parametric expression for the maximum achievable cloning fidelity triplets is then provided. As a side-product, we also prove the optimality of the 1->2 asymmetric cloning machines that have been proposed in the literature.