Abstract
Now equipped with all the classical notions needed to understand cooling, in the fifth lesson we addressed the question of the temperature limit attainable in the quantum regime where the electrical resonator is, in the absence of a pump, close to its fundamental state. The electromechanical system from the previous lesson is now assumed to be in the resolved sideband regime, which means that the frequency of the mechanical oscillator is very large compared to the linewidth of the electrical oscillator, which of course has a resonance frequency much higher than that of the mechanical oscillator. Finally, the very low damping of the electrical oscillator ensures that its linewidth is very small compared to that of the mechanical oscillator.
