Optimal estimation of joint parameters in phase space

M. G. Genoni, M. G A Paris, G. Adesso, Hyunchul Nha, P. L. Knight, M. S. Kim

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59 Citations (Scopus)

Abstract

We address the joint estimation of the two defining parameters of a displacement operation in phase space. In a measurement scheme based on a Gaussian probe field and two homodyne detectors, it is shown that both conjugated parameters can be measured below the standard quantum limit when the probe field is entangled. We derive the most informative Cramér-Rao bound, providing the theoretical benchmark on the estimation, and observe that our scheme is nearly optimal for a wide parameter range characterizing the probe field. We discuss the role of the entanglement as well as the relation between our measurement strategy and the generalized uncertainty relations.

Original languageEnglish
Article number012107
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume87
Issue number1
DOIs
Publication statusPublished - 9 Jan 2013

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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