Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transition operator approach for the description of spontaneous decay in
  a multi-qubit system   In this paper we discuss the use of the transition operator method for the
theoretical description of a multi-qubit system in a one-dimensional waveguide.
A general calculation has been performed for the N-qubit system, which was then
applied to the case of spontaneous decay for one and two qubits. The
probabilities of transitions in such systems, as well as the emission spectra,
are investigated in detail.

21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas