Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stochastic electrodynamics simulations for collective atom response in
  optical cavities   We study the collective optical response of an atomic ensemble confined
within a single-mode optical cavity by stochastic electrodynamics simulations
that include the effects of atomic position correlations, internal level
structure, and spatial variations in cavity coupling strength and atom density.
In the limit of low light intensity the simulations exactly reproduce the full
quantum field-theoretical description for cold stationary atoms and at higher
light intensities we introduce semiclassical approximations to atomic
saturation that we compare with the exact solution in the case of two atoms. We
find that collective subradiant modes of the atoms, with very narrow
linewidths, can be coupled to the cavity field by spatial variation of the
atomic transition frequency and resolved at low intensities, and show that they
can be specifically driven by tailored transverse pumping beams. We show that
the cavity optical response, in particular both the subradiant mode profile and
the resonance shift of the cavity mode, can be used as a diagnostic tool for
the position correlations of the atoms and hence the atomic quantum many-body
phase. The quantum effects are found to be most prominent close to the narrow
subradiant mode resonances at high light intensities. Although an optical
cavity can generally strongly enhance quantum fluctuations via light
confinement, we show that the semiclassical approximation to the stochastic
electrodynamics model provides at least a qualitative agreement with the exact
optical response outside the subradiant mode resonances even in the presence of
significant saturation of the atoms.

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The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
10
The categories of this paper are: q-bio