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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics III

Q 58.19: Poster

Donnerstag, 14. März 2019, 16:15–18:15, S Atrium Informatik

Giant Cross-Kerr Nonlinearity induced by a Strong Coupled Single Atom Cavity System — •Bo Wang, Nicolas Tolazzi, Jonas Neumeier, Christoph Hamsen, Tatjana Wilk, and Gerhard Rempe — Max Planck Institute of Quantum Optics, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

Cross Kerr nonlinearities have always been fascinating, especially in the context of modulating one light field with another, as this might have applications in quantum nondemolition measurements and quantum logic gates. In our setup, two separate transitions of a four level atom in an N-type scheme are strongly-coupled to two longitudinal modes of a cavity that are driven by light fields at wavelengths 780 nm and 795 nm[1]. The strong interaction between both light fields and the atom induced by cavity QED results in a huge nonlinearity on the level of individual photons. In out experiment, the signal light at 780nm is detuned by 30 MHz from atomic resonance and induces an AC-Stark shift on the atomic transition of up to about 200 kHz per photon, without absorption. This light shift manifests itself on a shift of the two photon resonance frequency in electromagnetically induced transparency(EIT) created by the probe light at 795nm. A cross-phase modulation(XPM) of 0.5 rad per photon between probe light and signal light is achieved.

C.Hamsen et al., Nature Physics 14, 885-889 (2018)