Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Defect states in hexagonal boron nitride: Assignments of observed
  properties and prediction of properties relevant to quantum computation   Key properties of nine possible defect sites in hexagonal boron nitride
(h-BN) are predicted using density-functional theory and are corrected by
applying results from high-level ab initio calculations. Observed h-BN
electron-paramagnetic resonance signals at 22.4, 20.83, and 352.70 MHz are
assigned to VN, CN, and VNO2B, respectively, while the observed photoemission
at 1.95 eV is assigned to VNCB. Detailed consideration of the available excited
states, allowed spin-orbit couplings, zero-field splitting, and optical
transitions are made for the two related defects VNCB and VBCN. VNCB is
proposed for realizing long-lived quantum memory in h-BN. VBCN is predicted to
have a triplet ground state, implying that spin initialization by optical means
is feasible and suitable optical excitations are identified, making this defect
of interest for possible quantum-qubit operations.

20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph