  We report on the experimental observation of stochastic resonance (SR) in a
nonGaussian active bath without any periodic modulation. A Brownian particle
hopping in a nanoscale double-well potential under the influence of nonGaussian
correlated noise, with mean interval ${{\tau }_{P}}$ and correlation time
${{\tau }_{c}}$, shows a series of equally-spaced peaks in the residence time
distribution at integral multiples of ${{\tau }_{P}}$. The strength of the
first peak is found to be maximum when the mean residence time ${{\bar{\tau
}}_{d}}$ matches the double condition, $4{{\tau }_{c}}\approx {{\tau
}_{P}}\approx {{\bar{\tau }}_{d}}\text{/}2$, demonstrating a new type of bona
fide SR. The experimental findings agree with a simple model that explains the
emergence of SR without periodic modulation of the double-well potential.
Additionally, we show that generic SR under periodic modulation, known to
degrade in strongly correlated continuous noise, is recovered by the discrete
nonGaussian kicks.
