Lasers could provide cooling effect in quantum experiments
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In the strange world of quantum mechanics, nothing is never actually absent, and now it turns out that nothing, or the absence of photons, can be used to cool objects.
One of the most common ways scientists cool objects is with lasers: when a particle of light with a specific frequency, called a photon, hits an atom or molecule, the atom or molecule absorbs the photon and emits another photon with a slightly higher energy, cooling the entire system.
Source: www.newscientist.com
