Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Germanium-Vacancy Single Photon Source in Diamond   Color centers in diamond are widely recognized as a promising solid state
platform for quantum cryptography and quantum information processing. For these
applications, single photon sources with a high intensity and reproducible
fabrication methods are required. Here, we report a novel color center in
diamond, composed of a germanium (Ge) and a vacancy (V) and named the GeV
center, which has a sharp and strong photoluminescence band with a zero-phonon
line at 602 nm at room temperature. We demonstrate this new color center works
as a single photon source. Both ion implantation and chemical vapor deposition
techniques enabled fabrication of GeV centers in diamond. A first-principles
calculation revealed the atomic crystal structure and energy levels of the GeV
center.

37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph