Sub-Heisenberg estimation of non-random phase-shifts

Ángel Rivas; Alfredo Luis

doi:10.1088/1367-2630/14/9/093052

Sub-Heisenberg estimation of non-random phase-shifts

Quantum Physics 2012-09-28 v3

Authors: Ángel Rivas , Alfredo Luis

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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 fixed finite mean number of photons. We achieve that by exploiting non-linearity of estimators and coherence with the vacuum.

Keywords

sub-Heisenberg estimation phase-shift Heisenberg bound non-linearity of estimators coherence with vacuum quantum metrology

Cite

@article{arxiv.1105.6310,
  title  = {Sub-Heisenberg estimation of non-random phase-shifts},
  author = {Ángel Rivas and Alfredo Luis},
  journal= {arXiv preprint arXiv:1105.6310},
  year   = {2012}
}

Comments

Published version. Partially rewritten including further explanations and more numerical simulations. Updated references

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