Squeezed states of light can improve feedback cooling significantly

How does the tightrope walker manage to maintain her balance and avoid that fatal drop from the sky? She carefully senses the motion of her body and vibrations of the rope and accordingly compensates any deviation from equilibrium by shifting her center of gravity. In a thermally excited system, the amplitude of the mechanical vibrations are directly linked to the system's temperature. Thus, by eliminating vibrations the system is cooled to a lower effective temperature.

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