Figure 1
From: Creating electronic oscillator-based Ising machines without external injection locking
Coupled oscillators as an Ising machine. (a) Schematic of the Schmitt-trigger based relaxation oscillator and the corresponding experimentally measured time domain output. (b) Illustrative graph, and the corresponding coupled oscillator circuit implementation to compute the MaxCut. (c,d) Time domain outputs and corresponding phase plots for a coupled system of oscillators (corresponding to the input graph on the left) with and without external second harmonic injection, respectively. It can be observed that the second harmonic signal is needed to realize the (Ising model-relevant) bipartition in the oscillator phases, required to solve the MaxCut problem. Without the second harmonic signal, the oscillator phases exhibit a continuous phase ordering.
