Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement generation in the Unruh effect   The master equation describing the completely positive time evolution of a
uniformly accelerated two-level system in weak interaction with a scalar field
in the Minkowski vacuum is derived and explicitly solved. It encodes the well
known Unruh effect, leading to a purely thermal equilibrium state. This
asymptotic state turns out to be entangled when the uniformly accelerating
system is composed by two, independent two-level atoms.

16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga