Stuttgart 2012 – wissenschaftliches Programm
Q 35.69: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.I+II
Strong coupling of single atoms to a high-Q whispering-gallery-mode bottle microresonator — •Christian Junge1, Danny O’Shea1, Konstantin Friebe1,2, Jürgen Volz1, and Arno Rauschenbeutel1 — 1Vienna Center for Quantum Science and Technology, TU Wien – Atominstitut, Stadionallee 2, 1020 Vienna, Austria — 2Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
We report on the observation of strong coupling between single atoms and a high-Q whispering-gallery-mode (Q = 50 million) of a bottle microresonator. Light is coupled evanescently into the resonator using a tapered optical fiber with an actively stabilized fiber–resonator gap. Cold rubidium atoms with an average temperature of 5 µK are delivered to the resonator by means of an atomic fountain. We observe single atom transit events in the resonator transmission spectrum which last several microseconds. In order to study the atom–resonator coupling in more detail, we have implemented a realtime detection scheme based on fast digital FPGA logic. This allows us to react to the arrival of atoms and to adopt the frequency and power of the light probing the bottle mode with a response time of less than 150 ns. We present our experimental results characterizing the strongly coupled atom–resonator system.
Financial support by the DFG, the Volkswagen Foundation, and the ESF is gratefully acknowledged.