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Sub-Heisenberg estimation of non-random phase shifts

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http://dx.doi.org/10.1088/1367-2630/14/9/093052

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Publication date

2012

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IOP Publishing
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https://hdl.handle.net/20.500.14352/44589

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Abstract

We provide evidence that the uncertainty in detection of small and deterministic phase-shift deviations from a working point can be lower than the Heisenberg bound, for a fixed finite mean number of photons. We achieve that by exploiting nonlinearity of estimators and coherence with the vacuum.

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© IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. We are grateful to Professors A Smerzi, L Maccone, M Tsang and M J W Hall for useful discussions. We acknowledge financial support from the project QUITEMAD S2009-ESP-1594 of the Consejeria de Educacion de la Comunidad de Madrid. AR acknowledges support from MICINN FIS2009-10061. AL acknowledges support from project no. FIS2008-01267 of the Spanish Direccion General de Investigacion del Ministerio de Ciencia e Innovacion.

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Óptica (Física)

Unesco subjects

2209.19 Óptica Física

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