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Frontiers in Optics

Quantum Metrology with Two Colours and Fibre Sources

B Bell, Sathya Kannan, Alex R. McMillan, Alex S. Clark, W. J. Wadsworth, John Rarity

Published Jan 1, 2012• 0 citations
Publisher

Abstract

Four-wave mixing in photonic crystal fibre is used to generate path-entangled states of photons of two colours, and demonstrate interference fringes oscillating at 2, 4, and 6 times the frequency of the classical pump laser.
DOI
10.1364/ls.2012.ltu4j.5

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A two-color quantum-entangled photon source is used to produce fourth-order interference. Because the period of the interference is produced by the frequency difference of the entangled photons, problems associated with counting fringes can be avoided. This also permits measurements at a virtual wavelength, which can prevent problems associated with transmission or absorption when such a longer wavelength may be needed. The interference wavelength can be varied with a geometry change in the beam path without any change in the source wavelength. The entangled photons are produced using an argon ion laser at 351 nanometers and a type I BBO crystal. The interference is detected in coincidence using four photomultiplier tubes.