Noise correlation and success probability in coherent Ising machines

Understand

We compared the noise correlation and the success probability of coherent Ising machines (CIMs) with optical delay-line, measurement feedback, and mean-field couplings.

• We theoretically studied three metrics for the noise correlations in these CIMs: quantum entanglement, quantum discord, and normalized correlation of canonical coordinates.
• The success probability was obtained through numerical simulations of truncated stochastic differential equations based on the Wigner distribution function.
• The results indicate that the success probability is more directly related to the normalized correlation function rather than entanglement or quantum discord.