p-bits for Probabilistic Spin Logic (PSL): A Brief Introduction

By Supriyo Datta

Electrical and Computer Engineering, Purdue University, West Lafayette, IN

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Digital electronics is based on stable bits that can have one of two values, 0 and 1. At the other extreme we have quantum computing using using q-bits that can be in superposition states that are 0 and 1 at the same time. In our recent work we have introduced a concept that is intermediate between bits and q-bits, namely a probabilistic bit or p-bit that fluctuates randomly between 0 and 1.

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Bayesian Inference and Optimization
  • [1] B.Behin-Aein, V.Diep and S.Datta “A Building Block for Hardware Belief Networks”, Scientific Reports 6, 29893 (2016).
  • [2] B.M. Sutton, K.Y. Camsari, B. Behin-Aein and S.Datta “Intrinsic optimization using stochastic nanomagnets” Scientific Reports, 7, 44370 (2017).
Invertible Boolean
  • [3] K.Y. Camsari, R.Faria, B.M.Sutton and S.Datta “Stochastic p-bits for Invertible Boolean Logic” Phys. Rev. X, 3, 031014 (2017).
  • [4] R. Faria, K.Y. Camsari and S. Datta ” Low Barrier Nanomagnets as p-bits for Spin Logic” IEEE Magnetics Letters, 8, 4105305 (2017).
Non-magnetic implementation
  • [5] A.Z.Pervaiz, L.A.Ghantasala, K.Y. Camsari and S.Datta, “Hardware Emulation of Stochastic p-bits for Invertible Logic,” Scientific Reports, 7, 10994 (2017).
  • [6] A.Z.Pervaiz, L.A.Ghantasala, B.M.Sutton and K.Y. Camsari “Weighted p-bits for FPGA implementation of probabilistic circuits,” arxiv.org/abs/1712.04166.
Embedded MRAM based implementation
  • [7] K.Y. Camsari, S. Salahuddin and S.Datta “Implementing p-Bits with Embedded MTJ’s,” IEEE Electron Device Letters, 38, 1767 (2017).
  • [8] O.Hassan, K.Y.Camsari and S.Datta ”Voltage-driven Building Block for Hardware Belief Networks,” arxiv.org/abs/1801.09026.
  • [9] R.Faria, K.Y.Camsari and S.Datta ”Implementing Bayesian Networks with Embedded MRAM,” AIP Advances, 8, 045101.

Cite this work

Researchers should cite this work as follows:

  • Supriyo Datta (2018), "p-bits for Probabilistic Spin Logic (PSL): A Brief Introduction," http://nanohub.org/resources/28680.

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Purdue University, West Lafayette, IN