Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement in the scattering process by local impurity   We study entanglement in the scattering processes by fixed impurity and Kondo
impurity. The fixed impurity plays a role as spin state filter that is employed
to concentrate entanglement between the scattering particle and the
unscattering particle. One Kondo impurity can entangle two noninteracting
scattering particles while one scattering particle can entangle two separate
noninteracting Kondo impurities.

22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph