Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster I
Q 23.44: Poster
Tuesday, March 12, 2024, 17:00–19:00, Tent B
Chromatic suppression of spontaneous emission — •Thomas Lafenthaler1, Yannick Weiser1, Tommaso Faorlin1, Lorenz Panzl1, Rainer Blatt1, 2, Thomas Monz1, 3, and Giovanni Cerchiari1, 4 — 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation, Technikerstrasse 21a, 6020 Innsbruck, Austria — 3AQT, Technikerstraße 17, 6020 Innsbruck, Austria — 4Department of Physics, University of Siegen, Walter-Flex-Str. 3, 57068 Siegen, Germany
We control the spontaneous emission of trapped Ba+ Ions with reflective boundary conditions. By reflecting the fluorescence light of the ion onto itself, the single photons emitted by the ions interfere with themselves, making it possible to control the emission rate. The control depends on the solid angle in which the emitted photons are retro-reflected and, to achieve complete control, we utilize a hemispherical mirror that can oversee the ion from every direction of space. When the mirror radius is adjusted to obtain destructive interference at the emitted photons wavelength, fluorescence, and consequently, the corresponding energy transition, can be suppressed. Here, I present our current effort to control the decay of the 6p1/2 state of the Ba+ ion which can relax by emitting 493 nm or 650 nm photons. Our aim is to demonstrate control over the decay branching ratio, which could find application in other experiments, for example, to suppress an unwanted relaxation branch or simplify its energy structure.
Keywords: Quantum optics; Spontaneous emission; branching ratio; emission control