Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of single neutral impurity atoms immersed in an ultracold gas   We report on controlled doping of an ultracold Rb gas with single neutral Cs
impurity atoms. Elastic two-body collisions lead to a rapid thermalization of
the impurity inside the Rb gas, representing the first realization of an
ultracold gas doped with a precisely known number of impurity atoms interacting
via s-wave collisions. Inelastic interactions are restricted to a single
three-body recombination channel in a highly controlled and pure setting, which
allows to determine the Rb-Rb-Cs three-body loss rate with unprecedented
precision. Our results pave the way for a coherently interacting hybrid system
of individually controllable impurities in a quantum many-body system.

11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys