Three-dimensional physical reservoir made of Ag₂S particles

Abstract

Three-dimensional physical reservoir is made by filling Ag₂S particles in a cylindrical space with input/output electrodes on both its top and bottom surfaces. Functions of nonlinear transformation and short-term memorization of input signals are achieved by the change in biased distribution of Ag⁺ cations in each Ag₂S particle, enabling the simple fabrication of the three-dimensional network just by filling Ag₂S particles into the cylindrical space. Benchmarking with the short-term memory task and with the parity-check task revealed that the three-dimensional reservoir of Ag₂S particles shows better performance than a two-dimensional reservoir of Ag₂S particles, even with use of the same number of electrodes.