10-GHz-clock time-multiplexed non-degenerate optical parametric oscillator network with a variable planar lightwave circuit interferometer

TL;DR

This paper demonstrates a large-scale coherent XY machine with over 47,000 spins, utilizing 10-GHz-clock time-multiplexed NOPO pulses and a variable planar lightwave circuit interferometer to control the XY spin network's effective temperature.

Contribution

The work introduces a scalable optical spin simulator using time-multiplexed NOPOs and a variable interferometer for precise temperature control, advancing physical simulation capabilities.

Findings

Achieved over 47,000 spins in the XY machine.

Controlled the effective temperature within two orders of magnitude.

Implemented a 10-GHz-clock time-multiplexed NOPO system.

Abstract

A coherent XY machine (CXYM) is a physical spin simulator that can simulate the XY model by mapping XY spins onto the continuous phases of non-degenerate optical parametric oscillators (NOPOs). Here, we demonstrated a large-scale CXYM with >47,000 spins by generating 10-GHz-clock time-multiplexed NOPO pulses via four-wave mixing in a highly nonlinear fiber inside a fiber ring cavity. By implementing a unidirectional coupling from the i-th pulse to the (i+1)-th pulse with a variable 1-pulse delay planar lightwave circuit interferometer, we successfully controlled the effective temperature of a one-dimensional XY spin network within two orders of magnitude.