Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decoherence imaging of spin ensembles using a scanning single-electron
  spin in diamond   The nitrogen-vacancy (NV) defect center in diamond has demonstrated great
capability for nanoscale magnetic sensing and imaging for both static and
periodically modulated target fields. However, it remains a challenge to detect
and image randomly fluctuating magnetic fields. Recent theoretical and
numerical works have outlined detection schemes that exploit changes in
decoherence of the detector spin as a sensitive measure for fluctuating fields.
Here we experimentally monitor the decoherence of a scanning NV center in order
to image the fluctuating magnetic fields from paramagnetic impurities on an
underlying diamond surface. We detect a signal corresponding to roughly 800
${\mu}_B$ in 2 s of integration time, without any control on the target spins,
and obtain magnetic-field spectral information using dynamical decoupling
techniques. The extracted spatial and temporal properties of the surface
paramagnetic impurities provide insight to prolonging the coherence of
near-surface qubits for quantum information and metrology applications.

21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc