Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 49: Quantum Dots: Optical Properties III
HL 49.1: Talk
Wednesday, March 22, 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 Schmidt1,2, 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 EXH=EXXH. 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)