Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Motion-induced signal revival in pulsed Rydberg four-wave mixing beyond
  the frozen gas limit   We present measurements on pulsed four-wave mixing involving a Rydberg state
in an atomic vapor cell. The excitation to the Rydberg state is conducted by a
pulsed two-photon excitation on the nanosecond timescale that is combined with
a third CW laser in phase-matched geometry yielding light emission on the same
timescale. An additional signal peak is observed shortly after the pulse that
can be attributed to a revival of constructive interference between different
velocity classes of the radiating atomic dipoles. Furthermore we investigate
the density dependence of the four-wave mixing signal. From the shape of the
respective curve we are able to confirm energy and momentum conservation in the
photonic part of the system.

14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn