Abstract
The response of a noisy nonlinear system to deterministic input signals can be enhanced by cooperative phenomena. We show that when one presents two square waves as input to a two-state system, the response of the system can produce a logical output () with a probability controlled by the noise intensity. As one increases the noise (for fixed threshold or nonlinearity), the probability of the output reflecting a operation increases to unity and then decreases. Changing the nonlinearity (or the thresholds) of the system changes the output into another logic operation () whose probability displays analogous behavior. The interplay of nonlinearity and noise can yield logic behavior, and the emergent outcome of such systems is a logic gate. This “logical stochastic resonance” is demonstrated via an experimental realization of a two-state system with two (adjustable) thresholds.
- Received 5 September 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.104101
©2009 American Physical Society