SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster III

Q 42.34: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

Manipulation of fluorescence emission as a tool for quantum optics experiments — •Yannick Weiser, Lorenz Panzl, Giovanni Cerchiari, and Rainer Blatt — University of Innsbruck, Technickerstraße 25, 6020 Innsbruck, Austria

We control the spontaneous emission of a trapped Ba⁺ ion by back reflecting the fluorescence light of the ion onto itself via a mirror. Due to this retro reflection, the emitted photon interferes with itself, which enhances, or suppresses the emission rate, depending on the ion-mirror distance. We are working in two regimes. A static one, where the distance between the ion and the mirror is fixed and a dynamic one, where the optical path length is modulated. In both cases, applications in the field of quantum optics and quantum optomechanics are investigated.

In the static regime, we will alter the decay rate of the ion with a spherical mirror. This can suppress the fluorescence rate to 6% of its natural value. Using the spherical mirror, not only position measurements down to the quantum level are possible, but also the variance of the motional state becomes accessible. Since this scheme relies on the interaction of the fluorescence light with the emitter, no narrow internal transition is needed.

In the dynamic regime, the ion-mirror optical path will be modulated with a phase modulator. By driving the modulation with the motional frequency of the ion we can cool, or excite the ion’s motion.