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Related Experiment Video

Updated: Dec 27, 2025

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

Speed-up coherent Ising machine with a squeezed feedback system.

Lihaonan Luo, Hongjun Liu, Nan Huang

|March 4, 2020

Summary

We introduce the S-CIM, a faster coherent Ising machine using squeezed feedback. This novel approach enhances quantum properties and significantly reduces computation time for complex optimization problems.

Area of Science:

Quantum computing
Combinatorial optimization
Physical systems

Background:

Coherent Ising Machines (CIMs) are emerging solvers for NP-hard problems.
Developing CIMs for practical applications requires performance enhancements.

Purpose of the Study:

To propose and evaluate a speed-up coherent Ising machine (S-CIM) utilizing a squeezed feedback system.
To enhance the computational performance of CIMs for combinatorial optimization.

Main Methods:

Coupling squeezed feedback pulses into a degenerate optical parametric oscillator (DOPO) network.
Conducting simulations to analyze quantum inseparability and fluctuations.
Performing computation experiments on MAX-CUT problems of varying sizes (4 to 20000).

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

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Main Results:

S-CIM demonstrated enhanced quantum inseparability in the DOPO network.
Quantum fluctuations were significantly reduced near the oscillation threshold.
S-CIM increased optimal normalized output by 2.27% and reduced computation time by 75.12%.

Conclusions:

The S-CIM effectively accelerates combinatorial optimization processes.
Squeezed feedback is a promising technique for improving CIM performance.
This research advances the development of CIMs for solving complex computational challenges.