Scientists unravel noise-assisted signal amplification in systems with memory

The AMOLF researchers are the first ones to probe the role memory plays in the stochastic resonance phenomenon. The study, conducted at one oil-filled optical micro-activity, suggests that the stochastic resonance gets robust to the variations present in signal frequency while the system has memory. That has implications in several fields of energy technology and physics. The researchers, in particular, numerically reveal that launching slow nonlinearity in mechanical oscillator energy harvesting mechanism from noise could boost its effectiveness tenfold.

It’s not easy to focus on a challenging task when 2 individuals have a loud chat next to you. But, complete silence is not the best solution often. Be it soft music, humming of people chatting from a distance or traffic noise, for several people, optimum noise amount enables them in focusing better. That’s the human alternative of the stochastic resonance, says Said Rodriguez, the group leaders at AMOLF.

In the lab, stochastic resonance takes place in non-linear system that’s bistable, which implies that the output, for a particular input, can shift between two potential values, he added. When your input is periodic signal, the non-linear system’s response could be boosted by optimum noise level using stochastic resonance phenomenon, continued Said.

The findings of the study appear in the journal Physical Review Letters.

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