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Coherent Processes in an Ultracold Gas of Rydberg Atoms [Gruppenbericht]

M. Reetz‐Lamour, Thomas Amthor, André Luiz de Oliveira +4 more

Jan 1, 20060 citations

Correlated excitation dynamics in an ultracold Rydberg gas

Cristiano Simonelli, María Martínez Valado, Raffaele Faoro +6 more

Jan 1, 20150 citations

Rydberg Molecules and Polarons in Ultracold Strontium Gases

Francisco Camargo

In this work I describe the excitation spectra of Rydberg atoms in ultracold gases of strontium and their decay mechanisms. In a few-body regime, we observe a highly structured spectrum re ecting excitation of ultralong-range molecules consisting of one or more ground-state atoms bound to the Rydberg core in potential wells formed by the Rydbergelectron wave function. In a many-body regime, with hundreds of ground-state atoms within the Rydberg orbital, the Rydberg atoms can be viewed as an impurity in a quantum gas, connecting to important concepts in condensed matter physics. The spectrum for impurity excitation displays signatures of polaronic states, in which the Rydberg atom signi cantly perturbs the density of the background gas. Additionally, decay channels of Rydberg excitations are examined by monitoring the time evolution of Rydberg populations. The measured lifetimes reveal new information on the decay processes of Rydberg molecules and place limits on the time scales over which studies involving Rydberg species in cold, dense atomic gases can be undertaken and limit the coherence times for such measurements.In this work I describe the excitation spectra of Rydberg atoms in ultracold gases of strontium and their decay mechanisms. In a few-body regime, we observe a highly structured spectrum re ecting excitation of ultralong-range molecules consisting of one or more ground-state atoms bound to the Rydberg core in potential wells formed by the Rydbergelectron wave function. In a many-body regime, with hundreds of ground-state atoms within the Rydberg orbital, the Rydberg atoms can be viewed as an impurity in a quantum gas, connecting to important concepts in condensed matter physics. The spectrum for impurity excitation displays signatures of polaronic states, in which the Rydberg atom signi cantly perturbs the density of the background gas. Additionally, decay channels of Rydberg excitations are examined by monitoring the time evolution of Rydberg populations. The measured lifetimes reveal new information on the decay processes of Rydberg molecules and place limits on the time scales over which studies involving Rydberg species in cold, dense atomic gases can be undertaken and limit the coherence times for such measurements.

Aug 7, 20171 citation

Experiments with an Ultracold Gas of Rydberg atoms

J. Denskat, M. Reetz‐Lamour, Thomas Amthor +4 more

Jan 1, 20060 citations

Spectroscopy of an ultracold Rydberg gas and signatures of Rydberg–Rydberg interactions

Kilian Singer, M. Reetz‐Lamour, Thomas Amthor +3 more

We report on experiments on Rydberg–Rydberg interaction-induced effects in a gas of 87 Rb Rydberg atoms. A compact setup for two-photon continuous-wave excitation of high-lying Rydberg states out of an ultracold atomic gas is presented. The performance of the apparatus is characterized by high-resolution spectroscopy of Rydberg states. Signatures of interaction-induced effects are identified by qualitatively analysing the dependence of Rydberg excitation spectra on the intensity and the duration of the second-step laser excitation.We report on experiments on Rydberg–Rydberg interaction-induced effects in a gas of 87 Rb Rydberg atoms. A compact setup for two-photon continuous-wave excitation of high-lying Rydberg states out of an ultracold atomic gas is presented. The performance of the apparatus is characterized by high-resolution spectroscopy of Rydberg states. Signatures of interaction-induced effects are identified by qualitatively analysing the dependence of Rydberg excitation spectra on the intensity and the duration of the second-step laser excitation.

Journal of Physics B Atomic Molecular and Optical PhysicsJan 6, 200532 citations

From coherent collective excitation to Rydberg blockade on an atom chip

Julius de Hond, Rick van Bijnen, S. J. J. M. F. Kokkelmans +3 more

Using time-resolved measurements, we demonstrate coherent collective Rydberg excitation crossing over into Rydberg blockade in a dense and ultracold gas trapped at a distance of 100 $\ensuremath{\mu}\mathrm{m}$ from a room-temperature atom chip. We perform Ramsey-type measurements to characterize the coherence. The experimental data are in good agreement with numerical results from a master equation using a mean-field approximation and with results from a super-atom-based Hamiltonian. This represents significant progress in exploring a strongly interacting driven Rydberg gas on an atom chip.Using time-resolved measurements, we demonstrate coherent collective Rydberg excitation crossing over into Rydberg blockade in a dense and ultracold gas trapped at a distance of 100 $\ensuremath{\mu}\mathrm{m}$ from a room-temperature atom chip. We perform Ramsey-type measurements to characterize the coherence. The experimental data are in good agreement with numerical results from a master equation using a mean-field approximation and with results from a super-atom-based Hamiltonian. This represents significant progress in exploring a strongly interacting driven Rydberg gas on an atom chip.

arXiv:1810.04532Physical Review ADec 27, 201812 citations

Coherent excitation of Rydberg atoms in an ultracold gas

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