Phys. Rev. Lett. 54, 551–554 (1985)One-Atom MaserReceived 20 August 1984; published in the issue dated 11 February 1985 The exchange of photons between single Rydberg atoms and a single mode of a superconducting cavity with a quality factor Q=8×108 at 2 K was observed. Signals could still be detected with an average number of only 0.06 atom simultaneously in the cavity. With one Rydberg atom the linewidth of the maser transition at about 21 GHz was power broadened and at higher densities asymmetry of the transition was observed, which is ascribed to an ac Stark effect. © 1985 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.54.551
DOI:
10.1103/PhysRevLett.54.551
PACS:
42.52.+x
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