Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.17: Poster

Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof

Towards Cavity QED with N-type atoms — •Karl Nicolas Tolazzi, Christoph Hamsen, Haytham Chibani, Tatjana Wilk, and Gerhard Rempe — Max Planck Institute of Quantum Optics, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

The combination of electromagnetically induced transparency (EIT) and cavity QED leads to an interesting new regime with large light-light coupling [1]. This can be realized by a single atom with a lambda-type level scheme where one atomic transition (probe) is strongly coupled to an optical cavity. The second transition (control) in the lambda scheme can then be used to control the properties of the probe light field. Extending this scheme to an atom with a N-type level scheme where an additional transition (signal) is also strongly coupled to the cavity enables control of the EIT resonance [2,3]. This is due to the cavity-enhanced ac-Stark shift of the atomic levels by the signal light field. Thus even single photons in the signal field result in a detuning of the narrow EIT window which leads to considerable phase shifts in the probe beam [4]. This so called cross-phase modulation (XPM) can be understood as a strong effective Kerr nonlinearity which can be engineered on demand. We present first steps towards an experimental realization of this scheme with single ⁸⁷Rb atoms trapped inside a high finesse optical Fabry-Perot resonator of variable length.
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