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Single quantum emitters like atoms are well-known as non-classical lightsources which can produce photons one by one at given times, with reducedintensity noise. However, the light field emitted by a single atom can exhibitmuch richer dynamics. A prominent example is the predicted ability for a singleatom to produce quadrature-squeezed light, with sub-shot-noise amplitude orphase fluctuations. It has long been foreseen, though, that such squeezingwould be "at least an order of magnitude more difficult" to observe than theemission of single photons. Squeezed beams have been generated usingmacroscopic and mesoscopic media down to a few tens of atoms, but despiteexperimental efforts, single-atom squeezing has so far escaped observation.Here we generate squeezed light with a single atom in a high-finesse opticalresonator. The strong coupling of the atom to the cavity field induces agenuine quantum mechanical nonlinearity, several orders of magnitude largerthan for usual macroscopic media. This produces observable quadrature squeezingwith an excitation beam containing on average only two photons per systemlifetime. In sharp contrast to the emission of single photons, the squeezedlight stems from the quantum coherence of photon pairs emitted from the system.The ability of a single atom to induce strong coherent interactions betweenpropagating photons opens up new perspectives for photonic quantum logic withsingle emitters

Observation of squeezed light from one atom excited with two photons