Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 53: Poster: Quantum Optics and Photonics III

Q 53.58: Poster

Donnerstag, 9. März 2017, 17:00–19:00, P OG2

Strong coupling between nanofiber-trapped atoms and fully fiber-integrated Fabry-Perot microresonator — •Martin Blaha, Sarah M. Skoff, and Arno Rauschenbeutel — Vienna University of Technology, Stadionallee 2, A-1020 Vienna, Austria

For building key components of optical quantum networks, such as quantum memories, an efficient interaction between light and suitable quantum emitters is required. Moreover, the latter is a prerequisite for establishing interactions between individual photons by means of an optical nonlinearity.

In order to realize such an efficient light-matter interface, we plan to couple cold Cesium atoms to a fully fiber-integrated high-Q microresonator. The backbone of this experiment is a tapered optical fiber containing a sub-wavelength diameter waist. Using a two-color optical dipole trap, we interface an ensemble of laser-cooled atoms via the nanofiber waist, which is enclosed by two fiber Bragg gratings. They form a high-Q resonator for the D2 line of Cesium, while transmitting the trapping light.

This scheme combines cavity enhancement and collective coupling in a single system and thus allows one to reach a very large collective light-matter coupling strength, required to implement, e.g. an inherently fiber-coupled quantum memory. Further, we aim to use the strong coupling between the atoms and the light to observe cross-phase modulation of a probe pulse by the intensity of a signal pulse. This photon-photon interaction would then be a key ingredient for optical quantum information processing.