A fully programmable 100-spin coherent Ising machine with all-to-all connections*

We present a scalable optical processor with electronic feedback, based on networks of optical parametric oscillators. The design of our machine is inspired by adiabatic quantum computers, although it is not an AQC itself. Our prototype machine is able to find exact solutions of, or sample good approximate solutions to, a variety of hard instances of Ising problems with up to 100 spins and 10,000 spin-spin connections. Reference: P.L. McMahon, A. Marandi, et al. Science 354, No. 6312, pp. 614-617 (2016).