publication . Article . Preprint . 2014

Loss-resistant unambiguous phase measurement

Dinani, Hossein T.; Berry, Dominic W.;
Open Access
  • Published: 19 Jun 2014 Journal: Physical Review A, volume 90 (issn: 1050-2947, eissn: 1094-1622, Copyright policy)
  • Publisher: American Physical Society (APS)
Entangled multi-photon states have the potential to provide improved measurement accuracy, but are sensitive to photon loss. It is possible to calculate ideal loss-resistant states that maximize the Fisher information, but it is unclear how these could be experimentally generated. Here we propose a set of states that can be obtained by processing the output from parametric down-conversion. Although these states are not optimal, they provide performance very close to that of optimal states for a range of parameters. Moreover, we show how to use sequences of such states in order to obtain an unambiguous phase measurement that beats the standard quantum limit. We c...
free text keywords: Physics, Statistical physics, Fisher information, symbols.namesake, symbols, Parametric statistics, Phase variance, Quantum mechanics, Photon, Quantum limit, Accuracy and precision, Quantum Physics
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