Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum spin dynamics of individual neutral impurities coupled to a
  Bose-Einstein condensate   We report on spin dynamics of individual, localized neutral impurities
immersed in a Bose-Einstein condensate. Single Cesium atoms are transported
into a cloud of Rubidium atoms, thermalize with the bath, and the ensuing
spin-exchange between localized impurities with quasi-spin $F_i=3$ and bath
atoms with $F_b=1$ is resolved. Comparing our data to numerical simulations of
spin dynamics we find that, for gas densities in the BEC regime, the dynamics
is dominated by the condensed fraction of the cloud. We spatially resolve the
density overlap of impurities and gas by the spin-population of impurities.
Finally we trace the coherence of impurities prepared in a coherent
superposition of internal states when coupled to a gas of different densities.
For our choice of states we show that, despite high bath densities and thus
fast thermalization rates, the impurity coherence is not affected by the bath,
realizing a regime of sympathetic cooling while maintaining internal state
coherence. Our work paves the way toward non-destructive probing of quantum
many-body systems via localized impurities.

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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: hep-th