publication . Article . 2014

Loss-resistant unambiguous phase measurement

Dominic W. Berry;
Open Access
  • Published: 28 Aug 2014 Journal: Physical Review A, volume 90 (issn: 1050-2947, eissn: 1094-1622, Copyright policy)
  • Publisher: American Physical Society (APS)
Abstract
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...
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