The random glow of atoms typically destroys entanglement (a concept introduced by Schrödinger), but physicists turned this noise to their advantage. Two emission channels cancel each other out, like opposing waves — crest meets trough.

In the experiment, atoms with two energy levels were illuminated by a laser at an intermediate frequency. The resulting two pathways for photon emission, through superposition, completely eliminated the noise. Then electromagnetic amplification kicked in, and the laser beams became entangled: measuring one instantly determines the properties of the other, no matter the distance — confirming the ideas of Bell and the experiments of Aspect.

This method is valuable for quantum communication and quantum computers, where reliable sources are essential. Quantum noise turns out to be not a foe but a builder. The future holds a quantum internet, built on precise measurements and quantum optics.