Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of superconductivity and surface noise using a single
  trapped ion as a field probe   Measuring and understanding electric field noise from bulk material and
surfaces is important for many areas of physics. In this work, we introduce a
method to detect in situ different sources of electric field noise using a
single trapped ion as a sensor. We demonstrate the probing of electric field
noise as small as $S_E = 5.2(11)\times
10^{-16}\,\text{V}^2\text{m}^{-2}\text{Hz}^{-1}$, the lowest noise level
observed with a trapped ion to our knowledge. Our setup incorporates a
controllable noise source utilizing a high-temperature superconductor. This
element allows us, first, to benchmark and validate the sensitivity of our
probe. Second, to probe non-invasively bulk properties of the superconductor,
observing for the first time a superconducting transition with an ion. For
temperatures below the transition, we use our setup to assess different surface
noise processes. The measured noise shows a crossover regime in the frequency
domain, which cannot be explained by existing surface noise models. Our results
open perspectives for new models in surface science and pave the way to test
them experimentally.

23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph