Preparation of Long-Lived, Non-Autoionizing Circular Rydberg States of Strontium

• URL: http://arxiv.org/abs/2006.15921v1
• Date: Mon, 29 Jun 2020 10:28:36 GMT
• Title: Preparation of Long-Lived, Non-Autoionizing Circular Rydberg States of Strontium
• Authors: R. C. Teixeira, A. Larrouy, A. Muni, L. Lachaud, J.-M. Raimond, S. Gleyzes,1 and M. Brune
• Abstract summary: Strontium circular Rydberg atoms with a core excited in a $4D$ metastable level are impervious to autoionization over more than a few millisecond time scale. We observe singlet to triplet transitions due to the core optical manipulations, opening the way to a quantum microwave to optical interface.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Alkaline earth Rydberg atoms are very promising tools for quantum technologies. Their highly excited outer electron provides them with the remarkable properties of Rydberg atoms and, notably, with a huge coupling to external fields or to other Rydberg atoms while the ionic core retains an optically active electron. However, low angular-momentum Rydberg states suffer almost immediate autoionization when the core is excited. Here, we demonstrate that strontium circular Rydberg atoms with a core excited in a $4D$ metastable level are impervious to autoionization over more than a few millisecond time scale. This makes it possible to trap and laser-cool Rydberg atoms. Moreover, we observe singlet to triplet transitions due to the core optical manipulations, opening the way to a quantum microwave to optical interface.

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