Cavity-assisted emission of polarization-entangled photons from biexcitons in quantum dots with fine-structure splitting | Zendy

Stefan Schumacher | Zendy; Jens Förstner | Zendy; A. Zrenner | Zendy; Matthias Florian | Zendy; Christopher Gies | Zendy; P. Gärtner | Zendy; F. Jahnke | Zendy

Open Access

Cavity-assisted emission of polarization-entangled photons from biexcitons in quantum dots with fine-structure splitting

Author(s) -

Stefan Schumacher,

Jens Förstner,

A. Zrenner,

Matthias Florian,

Christopher Gies,

P. Gärtner,

F. Jahnke

Publication year - 2012

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.20.005335

Subject(s) - biexciton , physics , quantum entanglement , photon , quantum dot , photon entanglement , fine structure , polarization (electrochemistry) , degenerate energy levels , cavity quantum electrodynamics , quantum optics , exciton , atomic physics , quantum , quantum mechanics , open quantum system , chemistry

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.

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