Characterizing a universal cloning machine by maximum-likelihood estimation - art. no. 022106

Authors
Sacchi, MF
Citation
Mf. Sacchi, Characterizing a universal cloning machine by maximum-likelihood estimation - art. no. 022106, PHYS REV A, 6402(2), 2001, pp. 2106
Citations number
24
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW A
ISSN journal
10502947 → ACNP
Volume
6402
Issue
2
Year of publication
2001
Database
ISI
SICI code
1050-2947(200108)6402:2<2106:CAUCMB>2.0.ZU;2-T
Abstract
We apply a general method for the estimation of completely positive maps to the one-to-two universal covariant cloning machine. The method is based on the maxim um-likelihood principle, and makes use of random input states, a long with random projective measurements on the output clones. The downhill simplex algorithm is applied for the maximization of the likelihood functi onal.