Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent Spin Preparation of Indium Donor Qubits in Single ZnO Nanowires   Shallow donors in ZnO are promising candidates for photon-mediated quantum
technologies. Utilizing the indium donor, we show that favorable donor-bound
exciton optical and electron spin properties are retained in isolated ZnO
nanowires. The inhomogeneous optical linewidth of single nanowires (60 GHz) is
within a factor of 2 of bulk single-crystalline ZnO. Spin initialization via
optical pumping is demonstrated and coherent population trapping is observed.
The two-photon absorption width approaches the theoretical limit expected due
to the hyperfine interaction between the indium nuclear spin and the
donor-bound electron.

3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th