Large two-atom two-photon vacuum Rabi oscillations in a high quality cavity

Abstract

We predict large cooperative effect involving two atom two photon vacuum Rabi oscillations in a high quality cavity. The two photon emission occurs as a result of simultaneous de-excitation of both atoms with two photon resonance condition ${\omega }_1+{\omega }_2\approx {\omega }_a+{\omega }_b$, where ${\omega }_1$, ${\omega }_2$ are the atomic transition frequencies and ${\omega }_a$, ${\omega }_b$ are the frequencies of the emitted photons. The actual resonance condition depends on the vacuum Rabi couplings. The effect can be realized either with identical atoms in a bimodal cavity or with nonidentical atoms in a single mode cavity.

10 pages 6 figures. accepted in Phys. Rev. A