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Fenglu Zheng

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Proceedings Article | 27 November 2023 Poster + Paper

Aberration compensation-enabled large-scale antiferromagnetic spatial photonic Ising machine

Rongwei Zhu, Guoqing Ma, Fenglu Zheng, Junjie Yu

Proceedings Volume 12768, 127682C (2023) https://doi.org/10.1117/12.2688361

KEYWORDS: Spatial light modulators, Wavefront aberrations, Computing systems, Optical computing, Photons, Phase shifts, Phase modulation

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The spatial photonic Ising machine (SPIM) is a simple and elegant architecture capable of expanding the spin scale with ease, and thus this optical architecture is attractive for its potential in solving large-scale combinatorial optimization problems. Here, we propose a scheme for aberration compensation to improve the computing accuracy of the SPIM based on a spatial light modulator (SLM), resulting in good scalability. First, the gamma curve of the SLM is corrected with the help of double-hole interference fringes. Then, an enhanced phase shift interferometry is used to measure the aberration of the entire optical system, and this aberration is compensated by loading the compensation phase on the SLM. Moreover, an iterative algorithm using self-adaptive cluster flipping is proposed for accelerating the convergence of SPIM. During the converging process, the number of flipped spins within the cluster is updated dynamically according to the convergence speed and accuracy, which makes it possible to achieve a good balance between high speed and high accuracy. Further, a proof-of-principle experimental set-up of the optimized SPIM is implemented, and the ground-state search of an antiferromagnetic Ising model is demonstrated. As an example, this optimized Ising machine is used for solving the number partitioning problem. It is shown that the partition of 40,000 random numbers is well demonstrated, and the final partitioning accuracy is as high as 99.88%.

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