Optimal mirror phase-covariant cloning
Quantum Physics
2009-09-10 v2
Abstract
We propose a quantum cloning machine, which clones a qubit into two clones assuming known modulus of expectation value of Pauli Z-matrix. The process is referred to as the mirror phase-covariant cloning, for which the input state is a priori less known than that for the standard phase-covariant cloning. Analytical expressions describing the cloning transformation and fidelity of the clones are found. Extremal equations for the optimal cloning are derived and analytically solved by generalizing a method of Fiurasek [Phys. Rev. A 64, 062310 (2001)]. Quantum circuits implementing the optimal cloning transformation and their physical realization in a quantum-dot system are described.
Cite
@article{arxiv.0906.0182,
title = {Optimal mirror phase-covariant cloning},
author = {Karol Bartkiewicz and Adam Miranowicz and Şahin Kaya Özdemir},
journal= {arXiv preprint arXiv:0906.0182},
year = {2009}
}
Comments
6 pages, 5 figures