Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coupling a Surface Acoustic Wave to an Electron Spin in diamond via a
  Dark State   The emerging field of quantum acoustics explores interactions between
acoustic waves and artificial atoms and their applications in quantum
information processing. In this experimental study, we demonstrate the coupling
between a surface acoustic wave (SAW) and an electron spin in diamond by taking
advantage of the strong strain coupling of the excited states of a nitrogen
vacancy center, while avoiding the short lifetime of these states. The SAW-spin
coupling takes place through a lamda-type three-level system where two ground
spin states couple to a common excited state through a phonon-assisted as well
as a direct dipole optical transition. Both coherent population trapping and
optically-driven spin transitions have been realized. The coherent population
trapping demonstrates the coupling between a SAW and an electron spin coherence
through a dark state. The optically-driven spin transitions, which resemble the
sideband transitions in a trapped ion system, can enable the quantum control of
both spin and mechanical degrees of freedom and potentially a trapped-ion-like
solid state system for applications in quantum computing. These results
establish an experimental platform for spin-based quantum acoustic, bridging
the gap between spintronics and quantum acoustics.

12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph