Cavity-induced anti-correlated photon emission rates of a single ion

Abstract

We report on the alteration of photon emission properties of a single trapped ion coupled to a high finesse optical fiber cavity. We show that the vacuum field of the cavity can simultaneously affect the emissions in both the infrared (IR) and ultraviolet (UV) branches of the $\Lambda -$type level system of ${}^{40}{\mathrm{Ca}}^{+}$ despite the cavity coupling only to the IR transition. The cavity induces strong emission in the IR transition through the Purcell effect resulting in a simultaneous suppression of the UV fluorescence. The measured suppression of this fluorescence is as large as 66% compared with the case without the cavity. Through analysis of the measurement results, we have obtained an ion-cavity coupling of ${\bar{g}}_0=2\pi \cdot (5.3\pm 0.1)$ MHz, the largest ever reported so far for a single ion in the IR domain.

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• A single ion coupled to an optical fiber cavity
• Fiber-coupled single ion as an efficient quantum light source
• Purcell-enhanced optical spin readout of Nitrogen-Vacancy centers in diamond
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