Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherence Time Enhancement of Interacting Two-Level Systems in Aluminum
  Superconducting Resonators   Superconducting resonators are widely used in many applications such as qubit
readout for quantum computing applications, and kinetic inductance detectors.
These resonators are susceptible to numerous loss and noise mechanisms under
microwave excitation, especially the dissipation due to non-equilibrium
quasi-particles and two-level systems (TLS), which can result in a decrease of
the superconducting intrinsic quality factor ($Q_i$) in high quality
superconducting resonators. Particularly in the few-photon and low temperature
(T) regime, TLS losses can become a dominant loss mechanism. In this study,
novel aluminum half-wavelength resonators are investigated, focusing on the
loss properties at extra-low power and low temperature. An unusual increase of
$Q_i(T)$ with deceasing temperature is observed. This behavior is attributed to
the increase of TLS coherence time ($T_2$) at ultra-low temperatures and
powers. This $T_2$ increase is consistent with other work on resonant frequency
noise in resonators and measurements of individual TLS, and likely arises from
interacting TLS in the aluminum half-wavelength resonators.

37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess