Abstract
Noise plays a key role in the dynamics of many nonlinear systemsthrough the concept of stochastic resonance. We demonstrate that,when a single noise is applied to two functions with oppositeparities, the behavior of a nonlinear system is governed by adual stochastic response that, compared to the usual stochasticresonance, leads to a broad-band forcing frequency range, asensitivity increased by a factor of 20 and a robustness improvedby a factor of 40. The wide applicability of such a response issupported by our experimental observations in optics and inelectronics, and may also be important in many other nonlinearsystems embedded in noise, as for instance the Earth's climate.
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