An experimental tour-de-force: Entanglement between glass bead and light
Getting a glass bead to act like a quantum object by entangling it with light.
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Once cooled, the laser light has to give the bead a bit of a kick in just the right way to entangle the two. This is done by slightly increasing the frequency of the laser (meaning a bluer color). Now, the same Doppler shift that was removing energy is adding it.
In summary, we have two laser beams, one cooling and one heating. But the cooling beam can only cool if the bead is moving more than its absolute minimum, which the heating beam ensures happens. That means that the two light fields are correlated with each other via the motion of the bead . And that means the light fields are…
