Single Cs atoms as collisional probes in a large Rb magneto-optical trap

  title={Single Cs atoms as collisional probes in a large Rb magneto-optical trap},
  author={Claudia Weber and Shincy John and Nicolas Spethmann and Dieter Meschede and Artur Widera},
  journal={Physical Review A},
We study cold interspecies collisions of cesium and rubidium in a strongly imbalanced system with single and few Cs atoms. Observation of the single-atom fluorescence dynamics yields insight into light-induced loss mechanisms, while both subsystems can remain in steady state. This significantly simplifies the analysis of the dynamics, as Cs-Cs collisions are effectively absent and the majority component remains unaffected, allowing us to extract a precise value of the Rb-Cs collision parameter… 

Figures from this paper

Inserting single Cs atoms into an ultracold Rb gas

We report on the controlled insertion of individual Cs atoms into an ultracold Rb gas at ≈400 nK. This requires one to combine the techniques necessary for cooling, trapping and manipulating single

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

We present an experimental system to study the Bose polaron by immersion of single, well-controllable neutral Cs impurities into a Rb Bose-Einstein condensate (BEC). We show that, by proper optical

Stochastic dynamics of a few sodium atoms in a cold potassium cloud [data]

We provide the data and our jupyter notebooks used to generate the figures of our publication. Abstract: We report on the stochastic dynamics of a few sodium atoms immersed in a cold potassium cloud.

Motional and Spin Dynamics of Individual Neutral Impurities in an Ultracold Gas

Recent studies on the dynamics of single, neutral impurities immersed in an ultracold gas are reviewed. This paradigmatic model system is realized by the controlled doping of single Caesium atoms

Efimov states of heavy impurities in a Bose-Einstein condensate

We consider the problem of two heavy impurity particles embedded in a gas of weakly interacting light mass bosonic particles in the condensed state. Using the Bogoliubov approach to describe the

Entangling Lattice-Trapped Bosons with a Free Impurity: Impact on Stationary and Dynamical Properties

This work addresses the interplay of few lattice trapped bosons interacting with an impurity atom in a box potential and analyzes the overall response at the many-body level and contrast it to the single-particle level.

Spectral flow of trimer states of two heavy impurities and one light condensed boson

The spectral flow of three-body (trimer) states consisting of two heavy (impurity) particles sitting in a condensate of light bosons is considered. Assuming that the condensate is weakly interacting

Impurity transport through a strongly interacting bosonic quantum gas

Using near-exact numerical simulations, we study the propagation of an impurity through a one-dimensional Bose lattice gas for varying bosonic interaction strengths and filling factors at zero

Controlling chemical reactions of a single particle

Chemical reactions between a single trapped ion and a condensate of ultracold neutral atoms are investigated by controlling the quantum states of both ion and atoms—revealing the effect of the

Interaction-induced decay of a heteronuclear two-atom system

This experimental method allows us to single out a particular relaxation process and provides an extremely clean platform for collisional physics studies, and has implications for engineering of quantum states via controlled collisions and creation of two-qubit quantum gates.