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arXiv:quant-ph/0312024 · Physics Letters A

Separability in asymmetric phase-covariant cloning

A. T. Rezakhani, Sohail Siadatnejad, Armin Ghaderi

Published Dec 29, 2004• 23 citations
arXivHTMLPDF
DOI
10.1016/j.physleta.2004.12.015

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Quantum cloning can be reviewed as the optimal individual eavesdropping on quantum cryptography. Specifically, the optimal phase-covariant cloning is regarded as the optimal individual attack on the BB84 protocol. In this paper, by exploring Cerf s formalism, we prove the optimality of the asymmetric economical 1→2 phase-covariant quantum cloning in 2 dimensions working without ancilla. In proof, we derive another independent unitary transformation of this cloner. Our result covers previous contributions [Durt T, et al. Phys. Rev. A, 2004, 69:062316].