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Q: Fachverband Quantenoptik und Photonik
Q 7: Precision spectroscopy of atoms and ions I (joint session A/Q)
Q 7.6: Talk
Monday, March 14, 2022, 15:15–15:30, A-H2
Enhanced Dipolar Interactions — •Artur Skljarow1, Benyamin Shnirman1, Xiaoyu Cheng1, Charles S. Adams2, Tilman Pfau1, Robert Löw1, and Hadiseh Alaeian3 — 15. Physikalisches Institut and IQST, Universität Stuttgart, Pfaffenwaldring 57, Stuttgart, Germany — 2JQC Durham-Newcastle, Department of Physics, Durham University, South Road, Durham, United Kingdom — 3Department of Physics & Astronomy, Purdue Quantum Science & Engineering Institute, Purdue University, West Lafayette, IN, USA
The interest in nonlinear quantum optics based on strong photon-photon interactions continuously grows with time as it might lead to an all-optical quantum network.
Atoms aligned in a 1D chain or 2D lattice show stronger interactions than in an arbitrary 3D arrangement as they exchange photons in a favored direction. A wide variety of ultracold experiments makes use of this fact by trapping individual atoms in 1D or 2D optical traps or tweezers and probing their interaction with a free-space laser beam. In contrast to the ultracold experiments, here we create confined 1D light fields, well below the diffraction limit, with engineered nanophotonic devices and immerse them in a thermal cloud of atoms. As a result, we observe the first realization of repulsive blue-shifted dipole-dipole interactions in a thermal vapor. Additionally, we demonstrate the power of nanophotonics by boosting those interactions by almost one order of magnitude via a Purcell modification hence, creating a highly nonlinear medium.