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The team used thermal noise as the system for their calculations because it is always present -- noticeable in the hissing of your amplifier.

The main problem with room temperature is thermal noise, which perturbs delicate quantum dynamics.

Through this effect, the laser light cools the acoustic vibrations and creates an environment with less thermal noise which is, to an extent, "disturbing" noise for a quantum communication system, for example.

Previously, these temperature differences could not be measured quantitatively due to thermal noise.

On the other hand, uncooled detectors can operate at room temperature but suffer from low detectivity and slow response due to the higher thermal noise intrinsic to room temperature operation.