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A monolithically integrated optical Ising machine
Bo Wu1, Wenkai Zhang1, Shiji Zhang1
1Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China.
Nature Communications
|May 9, 2025
Summary
We developed a compact, energy-efficient optical Ising machine using optoelectronic coupled oscillators. This integrated system effectively solves combinatorial optimization problems, paving the way for advanced computing.
Area of Science:
- Physics
- Engineering
- Computer Science
Background:
- Growing demand for computational power and energy efficiency fuels research into optical Ising machines for optimization.
- Existing optical Ising machines face limitations in integration density and energy efficiency.
Purpose of the Study:
- To propose and demonstrate a monolithically integrated four-spin Ising machine.
- To address challenges in integration density and energy efficiency in optical Ising machines.
Main Methods:
- Utilized optoelectronic coupled oscillators for the Ising machine architecture.
- Integrated a custom Mach-Zehnder interferometer (MZI) symmetric matrix with an optical-electrical coupled (OEC) nonlinear unit.
- Achieved ultra-compact footprint (0.01 mm²) and high power efficiency (4 mW per unit) for the OEC unit.
Main Results:
- Demonstrated a reconfigurable real-valued coupling matrix with a mean fidelity of 0.986.
- Measured a spin evolution time of 150 ns and a round-trip time of 1.71 ns.
- Successfully found ground states for various four-spin Ising problems.
Conclusions:
- The proposed system offers significant improvements in footprint, power consumption, and convergence time.
- Represents a key advancement toward monolithic integration of all-optical physical annealing systems.
- Highlights the potential of optoelectronic coupled oscillators for scalable and efficient optimization.
