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Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2012

Ultimate sensitivity of precision measurements with Gaussian quantum light : a multi-modal approach

Olivier Pinel
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Julien Fade
Pu Jian
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Nicolas Treps
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  • PersonId : 828406
Claude Fabre
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  • PersonId : 828407

Résumé

Multimode Gaussian quantum light, which includes multimode squeezed and multipartite quadrature entangled light, is a very general and powerful quantum resource with promising applications in quantum information processing and metrology. In this paper, we determine the ultimate sensitivity in the estimation of any parameter when the information about this parameter is encoded in such light, irrespective of the information extraction protocol used in the estimation and of the measured observable. In addition we show that an appropriate homodyne detection scheme allows us to reach this ultimate sensitivity. We show that, for a given set of available quantum resources, the most economical way to maximize the sensitivity is to put the most squeezed state available in a well-de ned light mode. This implies that it is not possible to take advantage of the existence of squeezed fluctuations in other modes, nor of quantum correlations and entanglement between diff erent modes.
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Dates et versions

hal-00592390 , version 1 (12-05-2011)
hal-00592390 , version 2 (07-10-2011)

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Olivier Pinel, Julien Fade, Daniel Braun, Pu Jian, Nicolas Treps, et al.. Ultimate sensitivity of precision measurements with Gaussian quantum light : a multi-modal approach. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2012, 85 (1), 010101(R) [4 p.]. ⟨10.1103/PhysRevA.85.010101⟩. ⟨hal-00592390v2⟩
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