Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reducing entanglement with symmetries: application to persistent
  currents in impurity problems   We show how canonical transformations can map problems with impurities
coupled to non-interacting rings onto a similar problem with open boundary
conditions. The consequent reduction of entanglement, and the fact the density
matrix renormalization group (DMRG) is optimally suited for open boundary
conditions, increases the efficiency of the method exponentially, making it an
unprecedented tool to study persistent currents. We demonstrate its application
to the case of the one-channel and two-channel Kondo problems, finding
interesting connections between the two.

21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
1
The categories of this paper are: cs
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph