Two-photon gateway in one-atom cavity quantum electrodynamics

Details Two-photon gateway in one-atom cavity quantum electrodynamics Two-photon gateway in one-atom cavity quantum electrodynamics

2008-11-03

arxiv.org/abs/0811.0264v1

Phys. Rev. Lett. 101, 203602 (2008)

Physics

Quantum Physics

PRL, 4 figures

Scientific paper

10.1103/PhysRevLett.101.203602

Single atoms absorb and emit light from a resonant laser beam photon by photon. We show that a single atom strongly coupled to an optical cavity can absorb and emit resonant photons in pairs. The effect is observed in a photon correlation experiment on the light transmitted through the cavity. We find that the atom-cavity system transforms a random stream of input photons into a correlated stream of output photons, thereby acting as a two-photon gateway. The phenomenon has its origin in the quantum anharmonicity of the energy structure of the atom-cavity system. Future applications could include the controlled interaction of two photons by means of one atom.

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