Realization of an artificial active bath with controlled activity*

We study the motion of a Brownian particle in artificially generated active bath. The particle is confined in a time dependent optical harmonic potential generated by optical tweezers. Therefore, the particle feels an external active noise in the background of a thermal white noise. This system is assumed to mimic the motion of a Brownian particle in active bath such as a bath of swimming bacteria. In comparison to the real bacterial bath experiments in which the activity parameters cannot be controlled easily, in this experiments the activity of the artificially generated active bath can be modulated in more controlled manner. Consequently, it allows us to study the thermodynamics of the Brownian particle in the active bath of various conditions.