Economical Phase-Covariant Cloning of Qudits
Quantum Physics
2007-05-23 v3
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.
Cite
@article{arxiv.quant-ph/0407103,
title = {Economical Phase-Covariant Cloning of Qudits},
author = {Francesco Buscemi and Giacomo Mauro D'Ariano and Chiara Macchiavello},
journal= {arXiv preprint arXiv:quant-ph/0407103},
year = {2007}
}
Comments
10 pages revtex4, 7 figures, replaced with modified version