Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Annular Long Josephson Junctions in a Magnetic Field: Engineering and
  Probing the Fluxon Interaction Potential   The interaction of a Josephson fluxon with an external magnetic field-induced
potential in a long Josephson junction is investigated experimentally. The
thermal activation of the fluxon from a potential well is observed and
experiments probing its predicted quantum properties are discussed. A method
for engineering a magnetic double-well potential for a fluxon is proposed and
the use of the coupled fluxon states for quantum computation is suggested.

3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph