Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 33: Quantum light sources

HL 33.8: Vortrag

Mittwoch, 3. April 2019, 17:00–17:15, H34

Impact of the excitonic spin dynamics on the entanglement from a InGaAs quantum dot — •Samir Bounouar1, Gabriel Rein1, Julian Schleibner2, Alexander Carmele2, Peter Schnauber1, Andre Strittmatter1,3, Sven Rodt1, and Stephan Reitzenstein11Institut für Festkörperphysik, Technische Universität Berlin, Berlin, Germany — 2Institut für Theoretische Physik, Technische Universität Berlin, Berlin, Germany — 3Abteilung für Halbleiterepitaxie, Otto-von-Guericke, Universität, Magdeburg, Germany

Maximal entanglement is an important resource in photonic quantum technology and can be in principal generated by a semiconductor quantum dot even in the presence of finite fine structure splitting [1]. However, the exciton spin dynamics constitutes an important obstacle to perfect entanglement. We report on photon-correlation experiments performed on single InGaAs quantum dots integrated deterministically into monolithic microlenses. Non-phonon-mediated spin decoherence processes are systematically investigated and their influence on the quality of the generated entanglement by quantum dots is evaluated. In particular, exchange interaction, decoherence and nuclear spin induced precessions are evidenced through a series of tomography measurements on a large number of single quantum dots. A drop of the entanglement due to these processes is evidenced for small excitonic fine structure splittings and is discussed by a theoretical model introducing exchange interaction.

[1] S. Bounouar et al., Applied Physics Letters 112, 153107 (2018)

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2019 > Regensburg