Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for weakly and strongly interacting two-level systems in
  amorphous silicon   Quantum two-level systems (TLSs) intrinsic to glasses induce decoherence in
many modern quantum devices, such as superconducting qubits and single-photon
astronomical detectors. Although the low-temperature physics of these TLSs is
usually well-explained by the phenomenological standard tunneling model (STM)
of independent TLSs, the nature of these TLSs, as well as their behavior out of
equilibrium and at high energies above $1\,$K, remain inconclusive. Here we
measure the non-equilibrium dielectric loss of TLSs in amorphous silicon using
a superconducting resonator, where energies of TLSs are varied in time using a
time-dependent electric field. Our results show the existence of two distinct
ensembles of TLSs, interacting weakly and strongly with phonons. Analysis
within a previously proposed two-TLS model allows insight into the origins and
characteristics of the two types of TLSs, contributing to the loss near
equilibrium and far from equilibrium, respectively.

9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th