Quantum estimation by local observables

Masahiro Hotta, Masanao Ozawa

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The application of quantum estimation theory to solve the estimation problems for unknown parameters in the state of the system under investigation was analyzed. A Cramér Rao type inequality was established by obtaining an explicit form the Fisher information as a reciprocal lower bound for the mean-square errors of estimations by locally accessible observables. It was observed that the theory is also applicable in problem related to real situations. The application of this theory for solving problems for composite systems, where nontrivial combinatorics is needed for obtaining the Fisher information, was also analyzed.

Original languageEnglish
Article number022327
Pages (from-to)022327-1-0223271-3
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume70
Issue number2
DOIs
Publication statusPublished - 2004 Aug

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'Quantum estimation by local observables'. Together they form a unique fingerprint.

  • Cite this