Photonic polarization gears for ultra-sensitive angular measurements.

Abstract:

:Quantum metrology bears a great promise in enhancing measurement precision, but is unlikely to become practical in the near future. Its concepts can nevertheless inspire classical or hybrid methods of immediate value. Here we demonstrate NOON-like photonic states of m quanta of angular momentum up to m=100, in a setup that acts as a 'photonic gear', converting, for each photon, a mechanical rotation of an angle θ into an amplified rotation of the optical polarization by mθ, corresponding to a 'super-resolving' Malus' law. We show that this effect leads to single-photon angular measurements with the same precision of polarization-only quantum strategies with m photons, but robust to photon losses. Moreover, we combine the gear effect with the quantum enhancement due to entanglement, thus exploiting the advantages of both approaches. The high 'gear ratio' m boosts the current state of the art of optical non-contact angular measurements by almost two orders of magnitude.

journal_name

Nat Commun

journal_title

Nature communications

authors

D'Ambrosio V,Spagnolo N,Del Re L,Slussarenko S,Li Y,Kwek LC,Marrucci L,Walborn SP,Aolita L,Sciarrino F

doi

10.1038/ncomms3432

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

2432

issn

2041-1723

pii

ncomms3432

journal_volume

4

pub_type

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