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. 2017 Jun 12;8:15825. doi: 10.1038/ncomms15825

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Copyright © 2017, The Author(s)

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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(a) Scheme of the electrical circuit for the mutual synchronization of two oscillators independently supplied by two currents and connected through the microwave port of two bias tees with a tunable delay line ψ_Δτ. The detected signal is measured using a spectrum analyzer, connected to the delay with a −6 dBm power splitter (PS). (b) Evolution of the frequency of the interacting STOs as a function of I_DC,1 while I_DC,2 is fixed to +10.6 mA. Corresponding spectra for I_DC,1=+10.8 mA (1), +11.25 mA (2), +11.8 mA (3) (Non-interacting oscillator properties when one is switched off are in orange and green softened curves).