Challenging metrological limits via coherence with the vacuum

Details Challenging metrological limits via coherence with the vacuum Challenging metrological limits via coherence with the vacuum

2011-05-31

arxiv.org/abs/1105.6310v2

Physics

Quantum Physics

5 pages, 2 figures, new version

Scientific paper

We provide evidence that the uncertainty in phase shift measurements can be
lower than the Heisenberg limit for fixed finite mean number of photons. We
achieve that by exploiting non-linearity of estimators and coherence with the
vacuum, which is a genuinely quantum concept.

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