Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 24: Quantum Dots and Wires, Optical Properties II: Single Photon Sources

HL 24.4: Talk

Tuesday, March 23, 2010, 12:15–12:30, H17

Nanowire quantum dots as an ideal source of entangled photon pairs — •Ranber Singh and Gabriel Bester — Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany

We predict that semiconductor nanostructures grown along the [111] direction such as self-assembled quantum dots or nanowire quantum dots have vanishing fine structure splitting on the grounds of their symmetry and therefore, are ideal candidates for the generation of entangled photon pairs. We confirm this predicton by million-atom empirical pseudopotential calculations on realistic InAsP/InP and InGaAs/GaAs structures. We further study how robust the results are against deformations. Through the control of size, shape and composition the InAsP/InP nanostructures would emit at the optical fiber communication wavelength (conventional C band) of 1.55 µm (0.8 eV) which should boost their attractiveness.