Fig. 5From: The challenges of modern computing and new opportunities for opticsOverview of optical Ising machine. a Ising model. b Schematic of coherent Ising Machine (CIM) based on degenerate OPO. c Ising machine works in nonlinear regime of modulator [143]. d Ising machine based on multi-fiber. e Simulated annealing based on SLM. f Schematic of all-optical Ising machine [151]. Figures adapted under a CC BY 4.0 licence from ref. [143] (c), ref. [144] (d), ref. [151] (f)Back to article page