Economical Phase-Covariant Cloning of Qudits

Details Economical Phase-Covariant Cloning of Qudits Economical Phase-Covariant Cloning of Qudits

2004-07-14

arxiv.org/abs/quant-ph/0407103v3

Phys. Rev. A 71, 042327 (2005)

Physics

Quantum Physics

10 pages revtex4, 7 figures, replaced with modified version

Scientific paper

10.1103/PhysRevA.71.042327

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.

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