Hybrid: https://stockholmuniversity.zoom.us/j/622224375
Abstract: We propose a cooling protocol that uses phase-dependent parametric modulations of the trapping potential and phase preserving quantum measurements to cool a quantum harmonic oscillator to near its quantum-mechanical ground-state. We derive the optimal phase control for cooling, and show that the protocol provides an average cooling power proportional to the mean quanta in the oscillator. We demonstrate the robustness of our cooling protocol against dissipation, and phase errors in the feedback loop. Our work has implications for the cooling of mechanical resonators in the quantum regime and as a quantum refrigerator that can be integrated into circuits.