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. 2017 May 5;6(5):e16249. doi: 10.1038/lsa.2016.249

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/

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Second-order correlation function (g⁽²⁾(τ)) of down-conversion photons. (a) Self-correlation measurement of degenerate down-conversion photon pairs. Right inset: Power dependence of degenerate photon-pair generation rate. Normalized generation rate of 3.0 MHz mW⁻¹ has been fitted. (b) Cross-correlation measurement of the nearest non-degenerate down-conversion photon pairs. (c) Self-correlation measurement of the idler in the nearest non-degenerate down conversion. The left insets in a–c show the schematics of each measurement. The solid lines are fittings with the convolution function between a double exponential decay and a Gaussian distribution function related to the chosen bin width and detector jitter.