Widely tunable single photon source with high purity at telecom wavelength

2013/03/25 by Rui-Bo Jin, Ryosuke Shimizu, Kentaro Wakui +2 · 1 citation
Physics and Astronomy · #quant-ph #physics.optics

paper · pdf · doi:10.1364/oe.21.010659

published as Optics Express, Vol. 21, Issue 9, pp. 10659-10666 (2013) · 8 pages, 5 figures

arxiv created 2013/03/25 · arxiv updated 2013/04/26

Abstract

We theoretically and experimentally investigate the spectral tunability and purity of photon pairs generated from spontaneous parametric down conversion in periodically poled KTiOPO₄ crystal with group-velocity matching condition. The numerical simulation predicts that the purity of joint spectral intensity (P_JSI) and the purity of joint spectral amplitude (P_JSA) can be kept higher than 0.98 and 0.81, respectively, when the wavelength is tuned from 1460 nm to 1675 nm, which covers the S-, C-, L-, and U-band in telecommunication wavelengths. We also directly measured the joint spectral intensity at 1565 nm, 1584 nm and 1565 nm, yielding P_JSI of 0.989, 0.983 and 0.958, respectively. Such a photon source is useful for quantum information and communication systems.

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