Quantum estimation by local observables

Masahiro Hotta, Masanao Ozawa

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


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
Issue number2
Publication statusPublished - 2004 Aug


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