Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atomic filtering for hybrid continuous-variable/discrete-variable
  quantum optics   We demonstrate atomic filtering of frequency-degenerate photon pairs from a
sub-threshold optical parametric oscillator (OPO). The filter, a modified
Faraday anomalous dispersion optical filter (FADOF), achieves 70% peak
transmission simultaneous with 57 dB out-of-band rejection and a 445 MHz
transmission bandwidth. When applied to the OPO output, only the degenerate
mode, containing one-mode squeezed vacuum, falls in the filter pass-band; all
other modes are strongly suppressed. The high transmission preserves
non-classical continuous-variable features, e.g. squeezing or non-gaussianity,
while the high spectral purity allows reliable discrete-variable detection and
heralding. Correlation and atomic absorption measurements indicate a spectral
purity of 96% for the individual photons, and 98% for the photon pairs. These
capabilities will enable generation of atom-resonant hybrid states, e.g.
"Schr\"odinger kittens" obtained by photon subtraction from squeezed vacuum,
making these exotic states available for quantum networking and atomic quantum
metrology applications.

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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph