Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The photonic trumpet: An efficient, broadband interface between a
  solid-state quantum emitter and a Gaussian beam   We introduce the photonic trumpet, a dielectric structure which ensures a
nearly perfect coupling between an embedded quantum light source and a Gaussian
free-space beam. A photonic trumpet exploits both the broadband spontaneous
emission control provided by a single-mode photonic wire and the adiabatic
expansion of this mode within a conical taper. Numerical simulations highlight
the outstanding performance and robustness of this concept. As a first
application in the field of quantum optics, we report the realisation of an
ultra-bright single-photon source. The device, a GaAs photonic trumpet
containing few InAs quantum dots, demonstrates a first-lens external efficiency
of $0.75 \pm 0.1$.

25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio