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. 2017 Jul 6;7:4812. doi: 10.1038/s41598-017-05142-1

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Experimental setups. Schematic view of the experimental setup for the single photon counting and the heterodyne mixing measurement. The nanophotonic device is mounted inside a liquid helium cryostat at a temperature of 1.6 K with optical access (red and green lines and arrows) and electrical access (black lines). (a) Coherent detection configuration in which two lasers are connected to points 1 and 2 in the basic scheme. (b) Single laser configuration for coherent detection, which allows us to use one laser source as LO and the signal. The generated laser light is divided in two by a 50:50 splitter. One branch of the splitter is directly routed to the mixing setup, while the second one is shifted by ≈400 MHz by the mean of an AOM.