Extended Data Fig. 2: Josephson frequency as a function of the phase amplitude.
From: Measurement of the superfluid fraction of a supersolid by Josephson effect
Black dots are theory, red dots are experiment. Vertical error bars are extracted from the sinusoidal fit of the Josephson oscillations. Horizontal error bars are the s.e.m. of the phase difference detected at t = 0, after the phase imprinting. The highlighted region is the relevant one for the experiment. For typical experimental amplitudes π/2, we observe a frequency reduction of about 15% compared with the small-excitation regime.
