Journal
NEW JOURNAL OF PHYSICS
Volume 14, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/14/9/093052
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Funding
- Consejeria de Educacion de la Comunidad de Madrid [QUITEMAD S2009-ESP-1594]
- MICINN [FIS2009-10061]
- Spanish Direccion General de Investigacion del Ministerio de Ciencia e Innovacion [FIS2008-01267]
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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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