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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 4: Quantum dots and wires: Optical properties I

HL 4.9: Talk

Monday, March 12, 2018, 11:45–12:00, EW 201

Fully On-Chip Hanbury-Brown and Twiss Experiment with Semiconductor Quantum Dots — •Florian Hornung1, Mario Schwartz1, Ekkehart Schmidt2, Stefan Hepp1, Ulrich Rengstl1, Simone Luca Portalupi1, Michael Jetter1, Konstantin Ilin2, Michael Siegel2, and Peter Michler11Institut für Halbleiteroptik und Funktionelle Grenzflächen, Research Center SCoPE and IQST, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — 2Institute of Micro- and Nanoelectronic Systems (IMS), Karlsruhe Institute of Technology (KIT), Hertzstrasse 16, 76131 Karlsruhe, Germany

The generation, manipulation and detection of single photons on-chip is currently under strong investigation due to their large potential in quantum information processing. Up to now, experiments using laser excitation of quantum dots and on-chip detectors suffer from a high laser background on the detectors, which makes a temporal filtering of the detected signal necessary. [1]
Here, we present a fully integrated circuit, consisting of an InGaAs/GaAs quantum dot which is resonantly pumped, two single mode GaAs/AlGaAs waveguides forming a 50/50 beamsplitter structure and two NbN superconducting nanowire single photon detectors. With this system we perform on-chip second order correlation measurements on a single photon level without temporal filtering.

[1] G. Reithmaier et al. Nano Lett., 2015, 15 (8), pp 5208-5213.

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