Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compact sub-kilohertz low-frequency quantum light source based on
  four-wave mixing in cesium vapor   Using a nondegenerate four-wave mixing (FWM) process based on a
double-{\Lambda} scheme in hot cesium vapor, we demonstrate a compact
diode-laser-pumped quantum light source for the generation of quantum
correlated twin beams with a maximum squeezing of 6.5 dB. The squeezing is
observed at a Fourier frequency in the audio band down to 0.7 kHz which, to the
best of our knowledge, is the first observation of sub-kilohertz
intensity-difference squeezing in an atomic system so far. A phase-matching
condition is also investigated in our system, which confirms the
spatial-multi-mode characteristics of the FWM process. Our compact
low-frequency squeezed light source may find applications in quantum imaging,
quantum metrology, and the transfer of optical squeezing onto a matter wave.

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The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc