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Q: Fachverband Quantenoptik und Photonik

Q 44: Quantum Effects (Cavity QED)

Q 44.2: Vortrag

Mittwoch, 7. März 2018, 14:30–14:45, K 1.013

Strong Purcell effect on a neutral atom coupled to a fiber cavity — •Eduardo Urunuela, Wolfgang Alt, Jose Gallego, Tobias Macha, Miguel Martinez-Dorantes, Deepak Pandey, and Dieter Meschede — Institut für Angewandte Physik der Universität Bonn, Wegelerstraße 8, D-53115 Bonn, Germany

We observe sixfold Purcell broadening of an atomic resonance line of a ⁸⁷Rb atom, that is strongly coupled to a single-sided fiber-based Fabry–Pérot cavity. In our system, a single atom is trapped in a 3D optical lattice inside the cavity and externally driven by a near-resonant laser. The enhancement of the photon emission rate into the cavity mode corresponds to a cooperativity well beyond unity, with the resonator mode collecting up to 90% of the emitted photons. These photons build up an intra-cavity field that imprints a back-action on the atom’s driving conditions, leading to an enhancement of more than an order of magnitude of the total atomic emission. The photon leakage through the transmissive mirror is the dominant factor of the cavity field decay (κ≈2π×70 MHz), thus offering a high-bandwidth and fiber-coupled channel for single-photon interfacing. These properties are highly desirable in quantum network nodes such as fast and efficient quantum memories and single-photon sources.