Array-enhanced stochastic resonance in finite systems

A finite system of three coupled stochastic resonators is investigated with respect to the coupling constant. The consideration allows the analytical calculation of the spectral power amplification and of the signal-to-noise ratio. Whereas the local signal-to-noise ratio (SNR) of a single spin exhibits a maximum with respect to the coupling, the SNR of the global summed output of all spins decreases monotonically.