Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: InAs/GaAs (211)B quantum dots with negligible FSS for the generation of
  entangled photons   Polarization-resolved single dot spectroscopy performed on (211)B InAs/GaAs
quantum dots reveals that the fine structure splitting of the excitonic levels
in these dots is much lower compared to the usual (100)-grown InAs dots.
Time-resolved measurements confirm the high oscillator strength of these dots,
and thus their good quantum efficiency at 4 K, comparable with that of (100)
InAs/GaAs dots. Last, photon correlation measurements demonstrate single photon
emission out of the excitonic optical transition of these dots. All these
features make this novel dot system very promising for implementing solid-state
entangled photon sources.

5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess