Clouds of atoms can hide their light. When an atom moves to a lower-energy state, it emits a particle of light called a photon. But this process can be delayed and photons kept trapped inside a dense cloud of atoms, which may eventually prove useful for quantum devices that communicate using light.
When an atom absorbs a photon, exciting it to a higher-energy state, it will always release that photon and decay to its ground state in approximately the same amount of …
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May 14, 2021 at 04:08AM
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Clouds of atoms trap light in a way that could store quantum data - New Scientist
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