Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-level atom excitation probability for single- and $N$-photon
  wavepackets   We study how the transient excitation probability of a two-level atom by a
quantized field depends on the temporal profile of the incident pulse, in the
presence of external losses, for both coherent and Fock states, and in two
complementary limits: when the pulse contains only one photon (on average), and
when the number of photons $N$ is large. For the latter case we derive
analytical expressions for the scaling of the excitation probability with $N$
that can be easily evaluated for any pulse shape.

24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
16
The categories of this paper are: stat
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph