Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-level systems in superconducting quantum devices due to trapped
  quasiparticles   A major issue for the implementation of large scale superconducting quantum
circuits is the interaction with interfacial two-level system defects (TLS)
that leads to qubit relaxation and impedes qubit operation in certain frequency
ranges that also drift in time. Another major challenge comes from
non-equilibrium quasiparticles (QPs) that result in qubit dephasing and
relaxation. In this work we show that such QPs can also serve as a source of
TLS. Using spectral and temporal mapping of TLS-induced fluctuations in
frequency tunable resonators, we identify a subset of the general TLS
population that are highly coherent TLS with a low reconfiguration temperature
$\sim$ 300 mK, and a non-uniform density of states. These properties can be
understood if these TLS are formed by QPs trapped in shallow subgap states
formed by spatial fluctutations of the superconducting order parameter
$\Delta$. Magnetic field measurements of one such TLS reveals a link to
superconductivity. Our results imply that trapped QPs can induce qubit
relaxation.

26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph