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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.13: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Coupling, controlling, and processing non-transversal photons with a single atom — •Elisa Will, Michael Scheucher, Jürgen Volz, and Arno Rauschenbeutel — Vienna Center for Quantum Science and Technology, TU Wien, Atominstitut, Stadionallee 2, A-1020 Wien, Austria

In our experiment we investigate the strong interaction between single ⁸⁵Rb atoms and light confined in a bottle microresonator, a novel type of whispering-gallery-mode (WGM) microresonator. These resonators offer the advantage of very long photon lifetimes in conjunction with near lossless in- and out-coupling of light via tapered fiber couplers. In addition, we recently showed that the longitudinal polarization component of their evanescent field results in an inherent link between the local polarization of the light and its propagation direction. This fundamentally alters the physics of light-matter interaction leading to a new class of optical microresonators based on chiral interaction of light and matter [1].
Building on these properties, we recently realized a fiber-integrated optical Kerr-nonlinearity. There, the presence of the atom results in a strong nonlinear response of the resonator to the number of incident photons. As a consequence, we observe a nonlinear phase shift close to the maximum value of π between the cases where one or two photons pass the resonator [2]. Furthermore, we show that this results in entanglement between the two previously independent photons.
[1] C. Junge et al., Phys. Rev. Lett. 110, 213604 (2013)
[2] J. Volz et al., Nature Photon. 8, 965 (2014)