Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimizing the formation of depth-confined nitrogen vacancy center spin
  ensembles in diamond for quantum sensing   Spin ensembles of nitrogen vacancy (NV) centers in diamond are emerging as
powerful spin-based sensors for magnetic, electric and thermal field imaging
with high spatial and temporal resolution. Here we characterize the formation
of depth-confined NV center ensembles, activated by electron irradiation in
diamond layers grown by plasma enhanced chemical vapor deposition with nitrogen
co-doping. To do so, we exploit the high magnetic sensitivity of ensembles of
NV centers to probe their spin environment as a function of growth and
irradiation parameters. We engineer an NV ensemble whose magnetic sensitivity
is within a factor of two of the static NV-NV dipolar interaction limit, thus
demonstrating a powerful platform for quantum sensing.

15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an