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Related Experiment Video

Updated: Jan 11, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Time-multiplexed optoelectronic parametric oscillators with increased clock-rates toward Ising machine.

Haoyan Xu, Chong Liu, Qizhuang Cen

|November 11, 2025

Summary

This summary is machine-generated.

Researchers developed a faster Coherent Ising machine (CIM) using a Mach-Zehnder modulator, reaching a 1 GHz clock rate for solving complex optimization problems more efficiently than digital computers.

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Last Updated: Jan 11, 2026

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Area of Science:

Quantum computing
Optical physics
Computational science

Background:

Coherent Ising machines (CIMs) offer a promising heuristic approach for combinatorial optimization.
Current CIMs, particularly those using optoelectronic parametric oscillators (OEPOS), face clock-rate limitations due to electrical mixer constraints.

Purpose of the Study:

To enhance the clock rate of CIMs.
To maintain spin independence in high-speed CIMs.
To enable large-scale analog Ising machines for practical applications.

Main Methods:

Proposed using a Mach-Zehnder modulator (MZM) as the nonlinear element in the OEPO loop.
Implemented time-multiplexed OEPOS.
Generated 24,420 spins using ~5 km of optical fiber.

Main Results:

Achieved a 1 GHz clock rate for time-multiplexed OEPOS.
Demonstrated spin independence and long-term stability.
Generated binary sequences passing the NIST random number test.

Conclusions:

The MZM-based OEPO design significantly boosts CIM clock rates while preserving spin integrity.
This advancement is crucial for developing scalable analog Ising machines as commercial solvers for combinatorial optimization problems.