Large-Scale Photonic Ising Machine by Spatial Light Modulation

Quantum and classical physics can be used for mathematical computations that are hard to tackle by conventional electronics. Very recently, optical Ising machines have been demonstrated for computing the minima of spin Hamiltonians, paving the way to new ultrafast hardware for machine learning. Howe...

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Bibliographic Details
Published in:Physical review letters Vol. 122; no. 21; p. 213902
Main Authors: Pierangeli, D., Marcucci, G., Conti, C.
Format: Journal Article
Language:English
Published: United States American Physical Society 31.05.2019
Subjects:
Amplitude modulation
Couplings
Ferromagnetism
Ising model
Light modulation
Machine learning
Parallel degrees of freedom
Parallel processing
Phase modulation
Photonics
Spatial light modulators
ISSN:0031-9007, 1079-7114, 1079-7114
Online Access:Get full text
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Summary:Quantum and classical physics can be used for mathematical computations that are hard to tackle by conventional electronics. Very recently, optical Ising machines have been demonstrated for computing the minima of spin Hamiltonians, paving the way to new ultrafast hardware for machine learning. However, the proposed systems are either tricky to scale or involve a limited number of spins. We design and experimentally demonstrate a large-scale optical Ising machine based on a simple setup with a spatial light modulator. By encoding the spin variables in a binary phase modulation of the field, we show that light propagation can be tailored to minimize an Ising Hamiltonian with spin couplings set by input amplitude modulation and a feedback scheme. We realize configurations with thousands of spins that settle in the ground state in a low-temperature ferromagneticlike phase with all-to-all and tunable pairwise interactions. Our results open the route to classical and quantum photonic Ising machines that exploit light spatial degrees of freedom for parallel processing of a vast number of spins with programmable couplings.
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ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/PhysRevLett.122.213902