Optimal mirror phase-covariant cloning

Details Optimal mirror phase-covariant cloning Optimal mirror phase-covariant cloning

2009-05-31

arxiv.org/abs/0906.0182v2

Phys. Rev. A 80, 032306 (2009)

Physics

Quantum Physics

6 pages, 5 figures

Scientific paper

10.1103/PhysRevA.80.032306

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.

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