Extended Data Fig. 3: Alternative approach for phase III.
From: Observing dynamical phases of BCS superconductors in a cavity QED simulator
a, Simulation of an alternative experimental sequence. As described by the timing sequence at the top, we simulate an experiment that prepares the initial state using a π/2 pulse, lets the system evolve under a bimodal distribution of single-particle energy (see the inset) until ∣ΔBCS∣ reaches its minimum value and then quenches the system back to a continuous distribution of single-particle energies (inset). The theoretically predicted time trace of ∣ΔBCS∣ with χN/EW = 1.0 and δs,init/EW = 1.6 is shown at the bottom. The blue (grey dashed) line shows phase III dynamics under a continuous (bimodal) distribution. b, Long-time standard deviation of ∣ΔBCS(t)∣ after quenching to the continuous distribution shown in a. The white lines are dynamical phase boundaries for bimodal distributions (see Extended Data Fig. 2). Nearly all choices of parameters for phase III using bimodal distributions can lead to phase III behaviour after quenching to the continuous distribution.
