A semiconductor photon-pair source based on a polariton cascade

@misc{kawa2026semiconductor,
  title = {{A semiconductor photon-pair source based on a polariton cascade}},
  author = {Karol Kawa},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2609.17900},
  eprint = {2609.17900},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.17900},
}

TY  - UNPB
TI  - A semiconductor photon-pair source based on a polariton cascade
AU  - Karol Kawa
PY  - 2026
DA  - 2026/10/20
PB  - arXiv
DO  - 10.48550/arxiv.2609.17900
UR  - https://arxiv.org/abs/2609.17900
AB  - We present a theoretical study of a semiconductor photon-pair source based on a radiative cascade enabled by a permanent exciton dipole. The source consists of a GaAs quantum dot placed between a metal nanoparticle and a mirror. The dot exciton and the localized electromagnetic mode mix to form upper and lower polaritons. Without a permanent dipole, a symmetry separating states with even and odd excitation numbers forbids photon emission between the polaritons. Separation of the mean electron and hole positions gives the exciton a permanent dipole and breaks this symmetry. The upper polariton can then emit an idler photon as it decays to the lower polariton. The lower polariton can emit a signal photon as the system returns to its ground state. Using an effective model, we calculate the probability that a prepared upper polariton emits both photons through the metal antenna. We also analyze fluctuations in the emitted photon counts and correlations between the two emission channels. The calculation establishes an operating principle for assumed values of the coupling strength, emitter properties and optical loss rates. Whether the device can be built and its photon correlations measured remains open.
ER  -