The physics of optical computing
arXiv:2308.00088 · doi:10.1038/s42254-023-00645-5
Abstract
There has been a resurgence of interest in optical computing over the past decade, both in academia and in industry, with much of the excitement centered around special-purpose optical computers for neural-network processing. Optical computing has been a topic of periodic study for over 50 years, including for neural networks three decades ago, and a wide variety of optical-computing schemes and architectures have been proposed. In this paper we provide a systematic explanation of why and how optics might be able to give speed or energy-efficiency benefits over electronics for computing, enumerating 11 features of optics that can be harnessed when designing an optical computer. One often-mentioned motivation for optical computing -- that the speed of light is fast -- is not a key differentiating physical property of optics for computing; understanding where an advantage could come from is more subtle. We discuss how gaining an advantage over state-of-the-art electronic processors will likely only be achievable by careful design that harnesses more than one of the 11 features, while avoiding a number of pitfalls that we describe.
31 pages; 11 figures
References in corpus (10)
- Photonics for artificial intelligence and neuromorphic computing
- 11 TeraFLOPs per second photonic convolutional accelerator for deep learning optical neural networks
- Attojoule Optoelectronics for Low-Energy Information Processing and Communications: a Tutorial Review
- Network of Time-Multiplexed Optical Parametric Oscillators as a Coherent Ising Machine
- Ultra-low loss integrated visible photonics using thin-film lithium niobate
- An Optical Frontend for a Convolutional Neural Network
- Design and analysis of photonic crystal coupled cavity arrays for quantum simulation
- Thermalization of strongly interacting bosons after spontaneous emissions in optical lattices
- Photonic unsupervised learning processor for secure and high-throughput optical fiber communication
- On the physical (im)possibility of lightsabers