Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 49: Quantum Dots: Optical Properties III

HL 49.1: Vortrag

Mittwoch, 22. März 2017, 09:30–09:45, POT 151

A bright triggered twin-photon source in the solid state — •Tobias Heindel¹, Alexander Thoma¹, Martin von Helversen¹, Marco Schmidt^1,2, Alexander Schlehahn¹, Manuel Gschrey¹, Peter Schnauber¹, Jan-Hindrik Schulze¹, André Strittmatter¹, Jörn Beyer², Sven Rodt¹, Alexander Carmele³, Andreas Knorr³, and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — ²Physikalisch-Technische Bundesanstalt, Abbestraße 1, 10587 Berlin, Germany — ³Institut für Theoretische Physik, Technische Universität Berlin, 10623 Berlin, Germany

We propose and experimentally demonstrate the efficient, triggered generation of photon twins using the energy-degenerate biexciton-exciton radiative cascade of a single semiconductor quantum dot (QD) [1]. For this purpose, we select a QD whose exciton’s finestructure splitting equals the biexciton binding energy resulting in E_X^H=E_XX^H. Deterministically integrated within a microlens, this nanostructure emits highly-correlated photon pairs, degenerate in energy and polarization, at a rate of up to (234 ± 4) kHz. Furthermore, we directly observe the emitted twin-photon state by employing a photon-number-resolving detection system based on a transition edge sensor, which enables the reconstruction of the emitted photon number distribution.

A. Thoma, T. Heindel et al., A bright triggered twin-photon source in the solid state, arXiv:1608.02768 (2016)