Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct control of high magnetic fields for cold atom experiments based
  on NV centers   In cold atomic gases the interactions between the atoms are directly
controllable through external magnetic fields. The magnetic field control is
typically performed indirectly by stabilizing the current through a pair of
Helmholtz coils, which produce this large bias field. Here, we overcome the
limitations of such an indirect control through a direct feedback scheme, which
is based on nitrogen-vacancy centers acting as a magnetic field sensor. This
allows us to measure and stabilize fields of 4.66 mT down to 12 nT RMS noise
over the course of 24 h, measured on a 1 Hz bandwidth. We achieve a control of
better than 1 ppm after 20 minutes of integration time, ensuring high long-term
stability for experiments. This approach extends direct magnetic field control
to strong magnetic fields, which could enable new precise quantum simulations
in this regime.

7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga