Abstract
We consider cloning transformations of equatorial qubits and qutrits with the transformation covariant for rotation of the phases and The optimal cloning maps are derived without simplifying assumptions from first principles, for any number of input and output qubits, and for a single-input qutrit and any number of output qutrits. We also compare the cloning maps for global and single-particle fidelities, and we show that the two criteria lead to different optimal maps.
- Received 20 December 2002
DOI:https://doi.org/10.1103/PhysRevA.67.042306
©2003 American Physical Society