Designing the optimal quantum cloning machine for qubit case

Designing the optimal quantum cloning machine for qubit case According to the Fiurás̆ek’s optimal condition, where the average fidelity works as the figure of merit of quantum cloning machines (QCMs), the optimal cloning machine should maximize a convex mixture of the average fidelity. Based on this condition, we shall develop a general protocol of designing optimal QCMs for qubit system. With a series of examples, where the known optimal fidelities introduced in previous works are recovered with present scheme, we show that our protocol represents a general solution for the problem of cloning in qubit case. The unitary transformations for realizing the various kinds of optimal QCMS, are also given in a systematic way. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

Designing the optimal quantum cloning machine for qubit case

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Publisher
Springer Journals
Copyright
Copyright © 2011 by Springer Science+Business Media, LLC
Subject
Physics; Computer Science, general; Theoretical, Mathematical and Computational Physics; Quantum Physics; Mathematics, general; Physics, general
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-011-0226-1
Publisher site
See Article on Publisher Site

Abstract

According to the Fiurás̆ek’s optimal condition, where the average fidelity works as the figure of merit of quantum cloning machines (QCMs), the optimal cloning machine should maximize a convex mixture of the average fidelity. Based on this condition, we shall develop a general protocol of designing optimal QCMs for qubit system. With a series of examples, where the known optimal fidelities introduced in previous works are recovered with present scheme, we show that our protocol represents a general solution for the problem of cloning in qubit case. The unitary transformations for realizing the various kinds of optimal QCMS, are also given in a systematic way.

Journal

Quantum Information ProcessingSpringer Journals

Published: Jan 20, 2011

References

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