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arXiv:1103.3769 · Applied Physics Letters

Correlated photon-pair generation in a periodically poled MgO doped stoichiometric lithium tantalate reverse proton exchanged waveguide

Mirko Lobino, Graham D. Marshall, Chunle Xiong, Alex S. Clark, Damien Bonneau, Chandra M. Natarajan, Michael G. Tanner, Robert H. Hadfield, Sander N. Dorenbos, T. Zijlstra, Val Zwiller, Marco Marangoni, Roberta Ramponi, Mark G. Thompson, Benjamin J. Eggleton, Jeremy L. O’Brien

Published Aug 22, 2011• 28 citations

Abstract

We demonstrate photon-pair generation in a reverse proton exchanged waveguide fabricated on a periodically poled magnesium doped stoichiometric lithium tantalate substrate. Detected pairs are generated via a cascaded second order nonlinear process where a pump laser at wavelength of 1.55 μm is first doubled in frequency by second harmonic generation and subsequently downconverted around the same spectral region. Pairs are detected at a rate of 42/s with a coincidence to accidental ratio of 0.7. This cascaded pair generation process is similar to four-wave-mixing where two pump photons annihilate and create a correlated photon pair.

DOI: 10.1063/1.3628328

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We report on a new kind of correlated photon-pair source based on a waveguide integrated on a Periodically Poled Lithium Niobate substrate. Using a pump laser of a few micro-Watts at 657 nm, we generate degenerate photon-pairs at 1314 nm. Detecting about 1500 coincidences per second, we can infer a conversion rate of 10-6 pairs per pump photon, which is four orders of magnitude higher than that obtained with previous bulk sources. These results are very promising for the realization of sources for quantum communication and quantum metrology experiments requiring a high signal-to-noise ratio or working with more than one photon-pair at a time.