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 Crame ́r-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.

Optimal estimation of joint parameters in phase space / M.G. Genoni, M.G.A. Paris, G. Adesso, H. Nha, P.L. Knight, M.S. Kim. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 87:1(2013), pp. 012107.012107.1-012107.012107.7. [10.1103/PhysRevA.87.012107]

Optimal estimation of joint parameters in phase space

M.G. Genoni;M.G.A. Paris
Secondo
;
2013

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 Crame ́r-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.
Settore FIS/03 - Fisica della Materia
2013
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/218186
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