Scalable Ising Computer Based on Ultra-Fast Field-Free Spin Orbit Torque Stochastic Device with Extreme 1-Bit Quantization
Jialiang Yin, Yu Liu, Bolin Zhang, Ao Du, Tianqi Gao, Xiangyue Ma, Yi Dong, Yue Bai, Shiyang Lu, Yudong Zhuo, Yan Huang, Wenlong Cai, Daoqian Zhu, Kewen Shi, Kaihua Cao, Deming Zhang, Lang Zeng, Weisheng Zhao
Abstract
The Ising computer has great potential to solve complicated combinatorial optimization problems which beyond the capability of conventional computer unless the two major obstacles of easy-control high-speed low-power individual P-Bit and scalable large P-Bit array are overcame. In this work, an ultra-fast field-free P-Bit tunable by Spin Orbit Torque (SOT) Effect is proposed and carefully verified by throughout experimental measurement. Further, for the first time, an extreme 1-Bit quantization method against device variation is proposed for the hardware implementation of Ising computer with large P-Bit array. A novel Pareto front analysis methodology of Kullback-Leibler Divergence (KLD) is proposed to provide the practical and convenient criteria for the scalability judgement to large P-Bit array.