Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deterministic coupling of delta-doped NV centers to a nanobeam photonic
  crystal cavity   The negatively-charged nitrogen vacancy center (NV) in diamond has generated
significant interest as a platform for quantum information processing and
sensing in the solid state. For most applications, high quality optical
cavities are required to enhance the NV zero-phonon line (ZPL) emission. An
outstanding challenge in maximizing the degree of NV-cavity coupling is the
deterministic placement of NVs within the cavity. Here, we report photonic
crystal nanobeam cavities coupled to NVs incorporated by a delta-doping
technique that allows nanometer-scale vertical positioning of the emitters. We
demonstrate cavities with Q up to ~24,000 and mode volume V ~
$0.47({\lambda}/n)^{3}$ as well as resonant enhancement of the ZPL of an NV
ensemble with Purcell factor of ~20. Our fabrication technique provides a first
step towards deterministic NV-cavity coupling using spatial control of the
emitters.

34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess