Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vector DC magnetic-field sensing with reference microwave field using
  perfectly aligned nitrogen-vacancy centers in diamond   The measurement of vector magnetic fields with high sensitivity and spatial
resolution is important for both fundamental science and engineering
applications. In particular, magnetic-field sensing with nitrogen-vacancy (NV)
centers in diamond is a promising approach that can outperform existing
methods. Recent studies have demonstrated vector DC magnetic-field sensing with
perfectly aligned NV centers, which showed a higher readout contrast than NV
centers having four equally distributed orientations. However, to estimate the
azimuthal angle of the target magnetic field with respect to the NV axis in
these previous approaches, it is necessary to apply a strong reference DC
magnetic field, which can perturb the system to be measured. This is a crucial
problem, especially when attempting to measure vector magnetic fields from
materials that are sensitive to applied DC magnetic fields. Here, we propose a
method to measure vector DC magnetic fields using perfectly aligned NV centers
without reference DC magnetic fields. More specifically, we used the direction
of linearly polarized microwave fields to induce Rabi oscillation as a
reference and estimated the azimuthal angle of the target fields from the Rabi
frequency. We further demonstrate the potential of our method to improve
sensitivity by using entangled states to overcome the standard quantum limit.
Our method of using a reference microwave field is a novel technique for
sensitive vector DC magnetic-field sensing.

20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat