Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 59: SKM Symposium: Semiconductor Nanophotonics - Quantum Optics and Devices (SYNP)

HL 59.4: Hauptvortrag

Mittwoch, 16. März 2011, 16:15–16:45, TRE Ma

Generation of non-classical states of light with site- and potential-controlled pyramidal quantum dots — •Eli Kapon — Ecole Polytechnique Fédérale de Lausanne Laboratory of Physics of Nanostructures 1018 Lausanne, Switzerland

Generation of non-classical states of light, such as single photons, bunched photons and entangled photos, using semiconductor quantum dots (QDs) has been of major interest both for fundamental studies as well as for applications in quantum information processing. Here we review recent progress of such light generation using (In)GaAs/(Al)GaAs pyramidal QDs grown on patterned (111)B GaAs substrates, for which the location on a substrate, the heterostructure potential, and the emission wavelength can be controlled to a large extent. The control over nucleation site and 3D heterostructure configuration permits the design of the QD states energies and barriers, as well as the polarization of the emitted photons. The site- and emission wavelength-control make possible the integration of the QDs with optical nano-cavities in a reproducible and scalable manner. The (111) substrate orientation yields QDs of higher (C3v) symmetry as compared with most conventional QD systems, which leads to virtually vanishing fine structure splitting and high yield of 2X-X entangled photons emission. Recent results on polarization-entangled photon emission [1] and first observation of phonon-assisted coupling of 3D-confined excitons with optical cavity modes [2] will be presented and discussed. [1] A. Mohan et al., Nature Photonics 4, 302 (2010). [2] M. Calic et al., submitted (2010).