Noise-Induced Entrainment between Two Coupled Chemical Oscillators in Belouzov-Zhabotinsky Reactions

The entrainment dynamics of two chemical-oscillators in an excitable medium separated by some distance d was experimentally studied in the light-sensitive BelousovZhabotinsky reaction under application of external noise. Two chemical-oscillators were always spontaneously synchronized at sufficiently small d or frequency difference in the absence of noise. For insufficient distance to entrain each other, however, the frequency and phase were self-synchronized by application of noise. Increasing the noise intensity the entrainment frequency area between two oscillators increased and showed a maximum at a certain noise intensity, that is, an optimum noise intensity existed. We call this the noise-synchronaization phenomenon.