Fast Route to Thermalization

We present a control scheme for quantum systems coupled to a thermal bath. We demonstrate a state-to-state control between two Gibbs states. This scheme can be utilized to accelerate thermalization and to cool the open system. Starting from a microscopic description we derive the reduced system dynamics, leading to a non-adiabatic master equation. The equation contains non-trivial effects due to the non-adiabatic driving and bath interaction. These special features enable controlling the open system and accelerating the entropy changes. For a two-level system model, we obtain a general solution and introduce a reverse engineering scheme for control. The control problem is analyzed in the context of the theory of quantum control and the accompanied thermodynamic cost.