Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Subnatural-linewidth biphotons from a Doppler-broadened hot atomic vapor
  cell   We report the efficient generation of subnatural-linewidth (< 6 MHz, for Rb
D1/D2 lines) biphotons from a Doppler-broadened (530 MHz) hot atomic vapor
cell. We use on-resonance spontaneous four-wave mixing in a hot paraffin-coated
87Rb vapor cell at 63 C to produce time-frequency entangled photon pairs with
controllable bandwidth (1.9 - 3.2 MHz) and coherence time (47 - 94 ns). Our
backward phase-matching scheme with optical pumping is the key to minimize the
generation of uncorrelated photons from resonance fluorescence. The result
paves the way toward miniature narrowband biphoton source based on atomic cells

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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci