Power-efficient production of photon pairs in a tapered chalcogenide microwire

Abstract

Using tapered fibers of As2Se3 chalcogenide glass, we produce photon pairs at telecommunication wavelengths with low pump powers. We found maximum coincidences-to-accidentals ratios of $2.13\pm 0.07$ for degenerate pumping with 3.2 μW average power, and $1.33\pm 0.03$ for non-degenerate pumping with 1.0 μW and 1.5 μW average power of the two pumps. Our results show that the ultrahigh nonlinearity in these microwires could allow single-photon pumping to produce photon pairs, enabling the production of large entangled states, heralding of single photons after lossy transmission, and photonic quantum information processing with nonlinear optics.

arXiv comment5 pages, 6 figures. Updated to published version

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