Mátyás Koniorczyk, Lívia Dani, Vladimír Bužek
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.
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http://arxiv.org/abs/1304.1326
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