Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hybrid quantum magnetic field sensor with an electron spin and a nuclear
  spin in diamond   Recently, magnetic field sensors based on an electron spin of a nitrogen
vacancy (NV) center in diamond have been studied both from an experimental and
theoretical point of view. This system provides a nanoscale magnetometer, and
it is possible to detect a precession of a single spin. In this paper, we
propose a sensor consisting of an electron spin and a nuclear spin in diamond.
Although the electron spin has a reasonable interaction strength with magnetic
field, the coherence time of the spin is relatively short. On the other hand,
the nuclear spin has a longer life time while the spin has a negligible
interaction with magnetic fields. We show that, through the combination of such
two different spins via the hyperfine interaction, it is possible to construct
a magnetic field sensor with the sensitivity far beyond that of previous
sensors using just a single electron spin.

29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom