Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 42: Quantum Effects
Q 42.2: Talk
Thursday, March 9, 2017, 11:15–11:30, P 4
A light-atom interface based on a high numerical aperture lens — •Matthias Steiner1,2, Yue-Sum Chin1, and Christian Kurtsiefer1,2 — 1Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543 — 2Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
Quantum interfaces between atoms and photons require engineering of the coupling. Usually, this is accomplished with optical resonators. Tightly focused free-space modes are a complementary tool for interaction engineering.
We present a light-atom interface consisting of a single Rubidium atom trapped at the focus of a high numerical aperture lens, NA=0.75.
A coherent light beam probes the near-resonant interaction with the atom and we characterize the coupling strength by a reflection and a transmission measurement.
We investigate the temperature dependence of the interaction in order to understand whether the residual positional spread of the atom limits the interaction strength.
The resonance frequency shifts and interaction strength with the external field decreases when the atom is heated by the recoil of the scattered photons.
Comparing to a simple model, we conclude that the initial temperature reduces the interaction strength by less than 10% [1].
[1] Y.-S. Chin, M. Steiner, C. Kurtsiefer, arXiv:1611.08048