@article{3435,
  abstract     = {{Semiconductor quantum dots are promising sources for polarization-entangled photons. As an alternative
to the usual cascaded biexciton-exciton emission, direct two-photon emission from the biexciton can be used.
With a high-quality optical resonator tuned to half the biexciton energy, a large proportion of the photons
can be steered into the two-photon emission channel. In this case the degree of polarization entanglement is
inherently insensitive to the exciton fine-structure splitting. In the present work we analyze the biexciton emission
with particular emphasis on the influence of coupling of the quantum-dot cavity system to its environment.
Especially for a high-quality cavity, the coupling to the surrounding semiconductormaterial can open up additional
phonon-assisted decay channels. Our analysis demonstrates that with the cavity tuned to half the biexciton energy,
the potentially detrimental influence of the phonons on the polarization entanglement is strongly suppressed—high
degrees of entanglement can still be achieved. We further discuss spectral properties and statistics of the emitted
twin photons.}},
  author       = {{Heinze, Dirk and Zrenner, Artur and Schumacher, Stefan}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{24}},
  title        = {{{Polarization-entangled twin photons from two-photon quantum-dot emission}}},
  doi          = {{10.1103/PhysRevB.95.245306}},
  year         = {{2017}},
}