A search algorithm for quantum state engineering and metrology

In this paper we present a search algorithm that finds useful optical quantum states which can be created with current technology. We apply the algorithm to the field of quantum metrology with the goal of finding states that can measure a phase shift to a high precision. Our algorithm efficiently pr...

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Bibliographic Details
Published inNew journal of physics Vol. 18; no. 7; pp. 73033 - 73042
Main Author Knott, P A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 15.07.2016
Subjects
Algorithms
Metrology
Physics
quantum metrology
quantum optics
quantum state engineering
search algorithm
Search algorithms
Shot noise
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Summary:In this paper we present a search algorithm that finds useful optical quantum states which can be created with current technology. We apply the algorithm to the field of quantum metrology with the goal of finding states that can measure a phase shift to a high precision. Our algorithm efficiently produces a number of novel solutions: we find experimentally ready schemes to produce states that show significant improvements over the state-of-the-art, and can measure with a precision that beats the shot noise limit by over a factor of 4. Furthermore, these states demonstrate a robustness to moderate/high photon losses, and we present a conceptually simple measurement scheme that saturates the Cramér-Rao bound.
Bibliography:NJP-104863.R1
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/18/7/073033