Hannover 2013 – wissenschaftliches Programm

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

Q: Fachverband Quantenoptik und Photonik

Q 4: Quantum information: Quantum communication I

Q 4.4: Vortrag

Montag, 18. März 2013, 11:45–12:00, F 342

Strain Tuning of Quantum Dot Emissions: Towards Indistinguishable Photons from Separate Sources — •Bianca Höfer¹, Fei Ding¹, Eugenio Zallo¹, Jaixiang Zhang¹, Armando Rastelli², Rinaldo Trotta², and Oliver G. Schmidt¹ — ¹Institute for Integrative Nanosciences, IFW-Dresden, Helmholtzstrasse 20, D-01069 Dresden,Germany — ²Institute of Semiconductor and Solid State Physics,Johannes Kepler University Linz, Altenbergerstrasse 69, A-4040 Linz, Austria

For optical quantum networks it is necessary to create entangling states from separated single photon sources. Epitaxially grown semiconductor quantum dots QDs are promising candidates for this purpose, mainly due to the possibility to be integrated into solid state devices. In order to create entangled single photon states, the emission characteristics (such as energies, exciton lifetimes) of two QDs have to be identical. However, as-grown quantum dots have spectral inhomogeneity, which make post-growth tuning techniques indispensable. Among the others, strain has very recently emerged as a powerful tool to tune the excitonic emissions in QDs [R.Trotta et al., Advanced Materials 23, 2706 (2011)]. Here we present independent control over the exciton lifetime and the emission energy in a single InAs/GaAs QD, by using the combination of external strain and electrical fields. Our approach promises a higher degree of indistinguishability of photons emitted by separated QDs.