arXiv:2604.15364cs.ARcs.LG2026-04

用光学衍射实现无电实时图像分类,推理速度达纳秒级。

Photonic AI: A Hybrid Diffractive Holographic Neural System for Passive Optical Real-Time Image Classification

  • 通过全光学系统完成图像分类,无需电子计算
  • 3层结构在MNIST上达91.2%准确率,延迟仅纳米级
  • 首次建立学习与物理实现的映射关系,适合低功耗边缘场景

边缘智能受限于数据在电子存储层级中传输带来的能耗与延迟。光学系统提供根本不同的计算范式:输入波前进入结构化介质后,传播、衍射与干涉共同执行线性变换,其成本由波物理决定而非时钟算术。本文提出一种混合衍射全息神经架构,将衍射光学神经网络(DONN)与基于干涉学习(HIBL)的操作器结合,将数字优化的相位分布转化为可制造的物理干涉图案。完整推理流程由编码、相位调制、自由空间传播和强度测量构成,明确区分哪些量可学习、哪些由设计固定,以及光电检测引入非线性的位置。该算子理论视角填补了光学机器学习文献中学习变换与物理实现之间的空白。在物理信息仿真中,含约25,000个相位单元的三层系统在MNIST上实现91.2%测试准确率,传播限制下延迟为纳秒级。核心贡献并非性能指标,而是一个精确的计算框架:可学习表征被物理嵌入结构化光学介质,使推理通过被动器件中的波前变换完成,而非依赖电子乘累加操作。

原文摘要 · Abstract (English)

Edge intelligence is constrained by the energy and latency costs of shuttling data through electronic memory hierarchies. Optical systems offer a fundamentally different computational regime: once an input wavefront is launched into a structured medium, propagation, diffraction, and interference jointly enact a linear transformation whose cost is determined by wave physics rather than by clocked arithmetic. This paper develops a rigorous systems-level treatment of that regime and introduces a hybrid diffractive holographic architecture for image classification. The proposed model couples a Diffractive Optical Neural Network (DONN) with a Holographic Interference-Based Learning (HIBL) operator a formal map from digitally optimized phase distributions to physically realizable, fabrication-compatible interference patterns embeddable in passive optical elements. We express the full inference pipeline as a composition of encoding, phase modulation, free-space propagation, and intensity measurement operators, making explicit which quantities are learned, which are fixed by design, and where nonlinearity enters through photodetection. This operator-theoretic view resolves a persistent gap in the optical-ML literature between learning a transformation and physically realizing it. In physics-informed simulation on MNIST, a three-layer system with approximately 25,000 phase elements achieves 91.2% test accuracy with propagation-limited nanosecond-scale latency. The primary contribution is not a performance claim but a precise computational framework: learned representations can be physically embedded into structured optical media so that inference is executed by wavefront transformation through a passive, fabricated object rather than by sequential electronic multiply accumulate operations.

光学计算边缘智能衍射网络纳秒推理

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