Fig. 4: Measurement of the time-to-solution parameter for 4-spin MAX-CUT problem computation.
From: A spinwave Ising machine
SWIM time traces for the measurement of time-to-saturation τsat and time-to-solution τsolution parameters. a A control signal Vctrlampl for the linear amplifier. The linear amplifier switches down at the moment 1 μs with a blackout period of 2 μs to ensure signal suppression. b An amplified signal of RF propagating pulses Vampl. The time traces in (b) are colored according to a value of the calculated instantaneous signal to visually show the pulse instantaneous phase. c Phase values in the center of each propagating RF pulse sampled at each circulation period. Lines and circles are colored according to the number of the circulating RF pulse: Spin 1 - black, Spin 2 - brown, Spin 3 - red, Spin 4 - orange. d Mean circulation number and its standard deviation in the form of error bars with corresponding time-to-solution circulation time value for 4-spin MAX-CUT problem as a function of the additional coupling attenuation. Statistics is based on 10 consecutive measurements for each coupling attenuation. Individual points are shown as semitransparent orange circles. Note that some points may overlap.
