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We consider a particle, confined to a moving harmonic potential, under theinfluence of friction and external asymmetric Poissonian shot noise (PSN). Westudy the fluctuations of the work done to maintain this system in anonequilibrium steady state. PSN generalizes the usual Gaussian noise and canbe considered to be a paradigm of external noise, where fluctuation anddissipation originate from physically independent mechanisms. We consider twoscenarios: (i) the noise is given purely by PSN and (ii) in addition to PSN theparticle is subject to white Gaussian noise. In both cases we derive exactexpressions for the large deviation form of the work distribution, which arecharacterized by the time scales of the system. We show that the usual steadystate fluctuation theorem is violated in our model and that in a certainparameter regime large negative work fluctuations are more likely to occur thanthe corresponding positive ones, though the average work is always positive.

Steady state work fluctuations of a dragged particle under external and thermal noise