Optimal mirror phase-covariant cloning

Karol Bartkiewicz, Adam Miranowicz, Şahin Kaya Özdemir

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Abstract

We propose a quantum cloning machine, which clones a qubit into two clones assuming known modulus of expectation value of Pauli σz 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 Fiurášek [Phys. Rev. A 64, 062310 (2001)]. Quantum circuits implementing the optimal cloning transformation and their physical realization in a quantum-dot system are described.

Original languageEnglish (US)
Article number032306
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume80
Issue number3
DOIs
Publication statusPublished - Sep 3 2009

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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