Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 53: Poster II

HL 53.37: Poster

Mittwoch, 9. März 2016, 09:30–13:30, Poster A

Design of single-mode waveguides with integrated quantum dots for on-chip single-photon operations — •Ulrich Rengstl, Mario Schwartz, Thomas Herzog, Matthias Paul, Simone Luca Portalupi, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen (IHFG), Research Center SCoPE and IQST, Universität Stuttgart, Allmandring 3, D-70569 Stuttgart

The future use of linear optics quantum computation depends on a miniaturization and therefore a full integration of single-photon sources, beamsplitters and detectors on single chips. III-V semiconductors are promising candidates for the realization of such devices due to the simple implementation of quantum dots (QDs) as single-photon sources.

We present the integration of QDs in rib-type GaAs/AlGaAs waveguides. The design of the waveguides was optimized for the exclusive propagation of the fundamental TE- and TM-mode using frequency-domain simulations to obtain the mode profiles and dispersion diagrams. Time-domain simulations and measurements of propagation losses around 2.6 dB/mm depict the coupling of the QDs to low-loss propagation modes. The single-mode TE operation of our device is shown by the high degree of polarization of the propagating light.

An additional on-chip evanescent field coupler forms a 50:50 beamsplitter as fundamental operation on single photons. The purity of our integrated single-photon source is verified by cross-correlation measurements on the output arms of the beamsplitter.