We observe a sixfold Purcell broadening of the D2 line of an optically trapped 87Rb atom strongly coupled to a fiber cavity. Under external illumination by a near-resonant laser, up to 90% of the atom's fluorescence is emitted into the resonant cavity mode. The sub-Poissonian statistics of the cavity output and the Purcell enhancement of the atomic decay rate are confirmed by the observation of a strongly narrowed antibunching dip in the photon autocorrelation function. The photon leakage through the higher-transmission mirror of the single-sided resonator is the dominant contribution to the field decay (κ≈2π×50MHz), thus offering a high-bandwidth, fiber-coupled channel for photonic interfaces such as quantum memories and single-photon sources.
@article{arxiv.1804.08526,
title = {Strong Purcell effect on a neutral atom trapped in an open fiber cavity},
author = {Jose Gallego and Wolfgang Alt and Tobias Macha and Miguel Martinez-Dorantes and Deepak Pandey and Dieter Meschede},
journal= {arXiv preprint arXiv:1804.08526},
year = {2018}
}