ENTROPY OF PHASE MEASUREMENT - QUANTUM PHASE VIA QUADRATURE MEASUREMENT

Authors
HRADIL Z MYSKA R OPATRNY T BAJER J
Citation
Z. Hradil et al., ENTROPY OF PHASE MEASUREMENT - QUANTUM PHASE VIA QUADRATURE MEASUREMENT, Physical review. A, 53(6), 1996, pp. 3738-3742
Citations number
17
Categorie Soggetti
Physics
Journal title
Physical review. A → ACNP
ISSN journal
10502947
Volume
53
Issue
6
Year of publication
1996
Pages
3738 - 3742
Database
ISI
SICI code
1050-2947(1996)53:6<3738:EOPM-Q>2.0.ZU;2-Y
Abstract
The content of phase information of an arbitrary phase-sensitive measu rement is evaluated using the maximum likelihood estimation. The phase distribution is characterized by the relative entropy-a nonlinear fun ctional of input quantum state. As an explicit example, the multiple m easurement of the quadrature operator is interpreted as quantum phase detection achieving the ultimate resolution predicted by the Fisher in formation.