Simple Collision-Based Chemical Logic Gates with Adaptive Computing

Abstract

We present a method that is capable of implementing information transfer without any rigidly controlled architecture using the light-sensitive Belousov-Zhabotinsky (BZ) reaction system. Chemical wave fragments are injected into a subexcitable area and their collisions result in annihilation, fusion or quasi-elastic interactions depending on their initial positions. The fragments of excitation both pre and post collision possess a considerable freedom of movement when compared to previous implementations of information transfer in chemical systems. We propose that the collision of such wave fragments can be controlled automatically through adaptive computing. By extension, forms of unconventional computing, i.e., massively parallel non-linear computers, can be realised by such an approach. In this study we present initial results from using a simple evolutionary algorithm to design Boolean logic gates within the BZ system.

A brief history of liquid computers

“…9(f)). We employed the localisations to construct several logical gates and circuits [5,48,16,50,121].…”

Towards Cytoskeleton Computers. A Proposal

“…A range of prototypes of arithmetical circuits based on interaction of excitation wave-fronts has been implemented within the BZ methodology. These include Boolean gates [185,178,2,8,199,6], including evolving gates [198] and clocks [34]. A one-bit half-adder, based on a ballistic interaction of growing patterns [3], was implemented in a geometrically-constrained light-sensitive BZ medium [30].…”

On Boolean gates in fungal colony

“…[67,64,10,10,81,76,37,29,30,70,27,73,70,31]. Typically, logical gates and their cascade implemented in an excitable medium are 'handcrafted' to address exact timing and type of interactions between colliding wavefronts [67,64,1,9,74,8,20,71,82,72,32,7,69]. The artificial design of logical circuits might be suitable when chemical media or functional materials are used.…”