Borromean three-body FRET in frozen Rydberg gases.
Controlling the interactions between ultracold atoms is crucial for quantum simulation and computation purposes. Highly excited Rydberg atoms are considered in this prospect for their strong and controllable interactions known in the dipole-dipole case to induce non-radiative energy transfers between atom pairs, similarly to fluorescence resonance energy transfer (FRET) in biological systems. Here we predict few-body FRET processes in Rydberg atoms and observe the first three-body resonance energy transfer in cold Rydberg atoms using cold caesium atoms. In these resonances, additional relay atoms carry away an energy excess preventing the two-body resonance, leading thus to a Borromean type of energy transfer. These few-body processes present strong similarities with multistep FRET between chromophores sometimes called donor-bridge-acceptor or superexchange. Most importantly, they generalize to any Rydberg atom and could lead to new implementations of few-body quantum gates or entanglement.
Laboratoire Aimé Cotton, CNRS, Univ. Paris-Sud, ENS Cachan, Bât. 505, 91405 Orsay, France.|Physics Department, Universita di Pisa, Largo Pontecorvo 3, I-56127 Pisa, Italy.
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Faoro
Laboratoire Aimé Cotton, CNRS, Univ. Paris-Sud, ENS Cachan, Bât. 505, 91405 Orsay, France.
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Pelle
Laboratoire Aimé Cotton, CNRS, Univ. Paris-Sud, ENS Cachan, Bât. 505, 91405 Orsay, France.
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Zuliani
Laboratoire Aimé Cotton, CNRS, Univ. Paris-Sud, ENS Cachan, Bât. 505, 91405 Orsay, France.
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Cheinet
Physics Department, Universita di Pisa, Largo Pontecorvo 3, I-56127 Pisa, Italy.|INO-CNR, Via G. Moruzzi 1, 56124 Pisa, Italy.
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Arimondo
Laboratoire Aimé Cotton, CNRS, Univ. Paris-Sud, ENS Cachan, Bât. 505, 91405 Orsay, France.
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