A class of  optimal phase-covariant quantum cloning

Abstract

Abstract:

The phase-covariant quantum cloning has an important application in quantum cryptography. By exploiting a general unitary transformation, the fidelity of clones is derived. The result shows that there exists a class of the optimal phase-covariant quantum cloning. For these explicit transformations of the phase-covariant quantum cloning, the fidelity of clones is maximal and equal. Based on the cavity quantum electrodynamics, a scheme to implement the transformations of quantum cloning is proposed.

Key words: quantum information, quantum cloning, optimal phase-covariant quantum cloning, cavity quantum electrodynamics

CLC Number:

O431. 2

ZHANG Wenhai, DAI Jielin, CAO Zhuoliang, YANG Ming . A class of optimal phase-covariant quantum cloning[J]. J4, 2011, 28(5): 583-587.

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A class of optimal phase-covariant quantum cloning

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