Fig. 2

Dynamical photon bunching. a Measured intensity of the light emission from the left (blue) and right (red) mesa. The gray area indicates the region where signal-to-noise ratio (SNR) is insufficient for confident correlation measurements. b Measured population imbalance between two mesas (magenta points) clearly reveals the Josephson oscillations. Results of simulations (orange) match well the measured imbalance when convoluted with the Gaussian corresponding to the time resolution of the streak-camera being 3.4 ps (black). Time resolution is given in the plot. c Second-order correlation function g ⁽²⁾(0) of the light emission from the left (blue shaded) and right (red shaded) mesa shows that the light statistics changes from Poissonian (g ⁽²⁾(0) = 1) to bunched (g ⁽²⁾(0) > 1) in phase with Josephson oscillations. Shaded areas represent the error bars calculated as the standard errors of the mean values. The corresponding results of the theoretical simulations are shown with blue and red lines. d, e Simulated evolution of d the absolute value of the squeezing magnitude, and e the cosine term from Eq. (3) for the left (blue) and right (red) mesas