Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-frequency charge noise in Si/SiGe quantum dots   Electron spins in silicon have long coherence times and are a promising qubit
platform. However, electric field noise in semiconductors poses a challenge for
most single- and multi-qubit operations in quantum-dot spin qubits. Here, we
investigate the dependence of low-frequency charge noise spectra on temperature
and aluminum-oxide gate dielectric thickness in Si/SiGe quantum dots with
overlapping gates. We find that charge noise increases with aluminum oxide
thickness. We also find strong dot-to-dot variations in the temperature
dependence of the noise magnitude and spectrum. These findings suggest that
each quantum dot experiences noise caused by a distinct ensemble of two-level
systems, each of which has a non-uniform distribution of thermal activation
energies. Taken together, our results suggest that charge noise in Si/SiGe
quantum dots originates at least in part from a non-uniform distribution of
two-level systems near the surface of the semiconductor.

10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga