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Few-body interactions in frozen Rydberg gases

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  • Rydberg Few-Body Physics
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Abstract

The strong dipole-dipole coupling and the Stark tunability make Förster resonances an attractive tool for the implementation of quantum gates. In this direction a generalization to a N-body process would be a powerful instrument to implement multi-qubit gate and it will also path the way to the understanding of many-body physics. In this review, we give a general introduction on Förster resonances, also known as two-body FRET, giving an overview of the different application in quantum engineering and quantum simulation. Then we will describe an analogous process, the quasi-forbidden FRET, which is related to the Stark mixing due to the presence of an external electric field. We will then focus on its use in a peculiar four-body FRET. The second part of this review is focused on our study of few-body interactions in a cold gas of Cs Rydberg atoms. After a detailed description of a series of quasi-forbidden resonances detected in the proximity of an allowed two-body FRET we will show our most promising result: the observation of a three-body FRET. This process corresponds to a generalization of the usual two-body FRET, where a third atom serves as a relay for the energy transport. This relay also compensates for the energy mismatch which prevents a direct two-body FRET between the donor and the acceptor, but on the other side allowed a three-body process; for this reason, the three-body FRET observed is a “Borromean” process. It can be generalized for any quantum system displaying two-body FRET from quasi-degenerate levels. We also predict N-body FRET, based on the same interaction scheme. Three-body FRET thus promises important applications in the formation of macro-trimers, implementation of few-body quantum gates, few-body entanglement or heralded entanglement.

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Authors and Affiliations

  1. Laboratoire Aimé Cotton, Université Paris-Sud, ENS Cachan, CNRS, Université Paris-Saclay, 91405, Orsay Cedex, France

    Riccardo Faoro, Bruno Pelle & Alexandre Zuliani

  2. Università di Pisa, Largo B. Pontecorvo 3, 56127, Pisa, Italy

    Riccardo Faoro

Authors
  1. Riccardo Faoro
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  2. Bruno Pelle
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  3. Alexandre Zuliani
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Correspondence to Riccardo Faoro.

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Faoro, R., Pelle, B. & Zuliani, A. Few-body interactions in frozen Rydberg gases. Eur. Phys. J. Spec. Top. 225, 2935–2956 (2016). https://doi.org/10.1140/epjst/e2015-50335-0

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  • DOI: https://doi.org/10.1140/epjst/e2015-50335-0

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