Probability distributions consistent with a mixed state - art. no. 052308

Authors
Nielsen, MA
Citation
Ma. Nielsen, Probability distributions consistent with a mixed state - art. no. 052308, PHYS REV A, 6205(5), 2000, pp. 2308
Citations number
20
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW A
ISSN journal
10502947 → ACNP
Volume
6205
Issue
5
Year of publication
2000
Database
ISI
SICI code
1050-2947(200011)6205:5<2308:PDCWAM>2.0.ZU;2-7
Abstract
A density matrix rho may be represented in many different ways as a mixture of pure states, rho = Sigma (i)p(i)\psi (i)][psi (i)\. This paper characte rizes the class of probability distributions (p(i)) that may appear in such a decomposition, for a fixed density matrix rho. Several illustrative appl ications of this result to quantum mechanics and quantum information theory are given.