Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resonant enhancement of MQT in Josephson junctions: the influence of
  coherent two-level systems   We report a theoretical study of the macroscopic quantum tunneling (MQT) in
small Josephson junctions containing randomly distributed two-level systems. We
focus on the magnetic field dependent crossover temperature $T_{cr}$ between
the thermal fluctuation and quantum regimes of switching from the
superconducting (the zero-voltage) state to a resistive one. In the absence of
two-levels systems the crossover temperature shows a smooth decrease with an
applied magnetic field characterized by an external flux $\Phi$. Beyond that we
predict a narrow peak in the dependence of $T_{cr}(\Phi)$ occurring in the
intermediate range of $\Phi$. The effect becomes more pronounced as the
junction size increases. We explain this effect quantitatively by a strong
resonant suppression of a potential barrier for the Josephson phase escape that
is due to the coherent quantum Rabi oscillations in two-level systems present
in the junction.

27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ