title: Cavity-assisted emission of polarization-entangled photons from biexcitons in quantum dots with fine-structure splitting.
abstract: We study the quantum properties and statistics of photons emitted by a quantum-dot biexciton inside a cavity. In the biexciton-exciton cascade, fine-structure splitting between exciton levels degrades polarization-entanglement for the emitted pair of photons. However, here we show that the polarization-entanglement can be preserved in such a system through simultaneous emission of two degenerate photons into cavity modes tuned to half the biexciton energy. Based on detailed theoretical calculations for realistic quantum-dot and cavity parameters, we quantify the degree of achievable entanglement.
authors.affiliation: Physics Department and Center for Optoelectronics and Photonics Paderborn (CeOPP), Universität Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany. stefan.schumacher@uni-paderborn.de
authors.forename: Stefan
authors.initials: S
authors.lastname: Schumacher
authors.forename: Jens
authors.initials: J
authors.lastname: Förstner
authors.forename: Artur
authors.initials: A
authors.lastname: Zrenner
authors.forename: Matthias
authors.initials: M
authors.lastname: Florian
authors.forename: Christopher
authors.initials: C
authors.lastname: Gies
authors.forename: Paul
authors.initials: P
authors.lastname: Gartner
authors.forename: Frank
authors.initials: F
authors.lastname: Jahnke
mesh_terms: D003198:Computer Simulation; D008027:Light; D015233:Models, Statistical; D045663:Quantum Dots; D011789:Quantum Theory; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation