Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stimulated emission of superradiant atoms in waveguide QED   We investigate the stimulated emission of superradiant atoms coupled to a
waveguide induced by a coherent-state photon pulse. We provide an analytical
result when a short $\pi$ pulse is incident, which shows that the atoms emit
photons coherently into the output pulse, which remains a coherent state in the
short pulse limit. An incident pulse is amplified in phase-preserving manner,
where noise is added almost entirely in the phase direction in phase space.
This property improves the ratio of intensity signal to noise after the
amplification for sufficiently short pulses. This is a unique feature different
from general phase-preserving linear amplifiers, where the signal-to-noise
ratio deteriorates in the amplification process. We also discuss the dependence
of the photon-emission probability on pulse parameters, such as the pulse area
and the duration.

18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat