Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High cooperativity coupling between a phosphorus donor spin ensemble and
  a superconducting microwave resonator   We investigate the coupling of an ensemble of phosphorus donors in an
isotopically purified $^{28}$Si host lattice interacting with a superconducting
coplanar waveguide resonator. The microwave transmission spectrum of the
resonator shows a normal mode splitting characteristic for high cooperativity.
The evaluated collective coupling strength $g_{\mathrm{eff}}$ is of the same
order as the loss rate of the spin system $\gamma$, indicating the onset of
strong coupling. We develop a statistical model to describe the influence of
temperature on the coupling strength from $50\,\mathrm{mK}$ to
$3.5\,\mathrm{K}$ and find a scaling of the coupling strength with the square
root of the number of thermally polarized spins.

1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-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
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas