Quantum phase estimation with lossy interferometers

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DOIResolve DOI: http://doi.org/10.1103/PhysRevA.80.013825
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TypeArticle
Journal titlePhysical Review A
Volume80
Issue1
Pages013825-1013825-10; # of pages: 10
AbstractWe give a detailed discussion of optimal quantum states for optical two-mode interferometry in the presence of photon losses. We derive analytical formulae for the precision of phase estimation obtainable using quantum states of light with a definite photon number and prove that maximization of the precision is a convex optimization problem. The corresponding optimal precision, i.e., the lowest possible uncertainty, is shown to beat the standard quantum limit thus outperforming classical interferometry. Furthermore, we discuss more general inputs: states with indefinite photon number and states with photons distributed between distinguishable time bins. We prove that neither of these is helpful in improving phase estimation precision.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number15584138
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Record identifierbebd185a-b22b-4c4b-bbe5-27bbbb44cf95
Record created2010-06-25
Record modified2016-05-09
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