Economical Phase-Covariant Cloning of Qudits
arXiv:quant-ph/0407103 · doi:10.1103/PhysRevA.71.042327
Abstract
We derive the optimal N to M phase-covariant quantum cloning for equatorial states in dimension d with M=kd+N, k integer. The cloning maps are optimal for both global and single-qudit fidelity. The map is achieved by an ``economical'' cloning machine, which works without ancilla.
arXiv comment10 pages revtex4, 7 figures, replaced with modified version
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