Process optimized quantum cloners
Mátyás Koniorczyk, Lívia Dani, Vladimír Bužek · arXiv (Cornell University) · 2013
The notion of process optimized cloners is introduced. These are quantum cloners optimized for the average fidelity of their joint output state with respect to a product of multiple originals. We design 1 to 2 quantum bit cloners using the numerical method for finding completely positive maps approximating a nonphysical one optimally, via semidefinite programming. We discuss the properties of the so-designed cloners as well as their relations to those known to be optimal with respect to the clone fidelity.