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. 2015 Jun 9;6:7376. doi: 10.1038/ncomms8376

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(a) Measurements of switching current distributions (SCDs) from 4 K down to 0.3 K. When increasing the temperature, the histograms move to lower values of switching currents I_sw and the s.d. σ increases. Each histogram collects 10⁴ switching events. (b) Thermal behaviour of the SCDs from 0.9 K down to 20 mK. The red lines are fits of the probability density of switching, according to equation (2) in the case of a dominant second harmonic component in the current-phase relation (CPR). Below 100 mK the histograms overlap, indicating the transition to the quantum regime, definitely confirmed by the their dependence in magnetic field. In panel c the function a(g) is plotted (black curve) and the red line is the value of the function in the limiting case of a pure second harmonic (CPR).