Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 30: Focus Session: On-Chip Quantum Photonics I

HL 30.4: Invited Talk

Tuesday, March 8, 2016, 12:45–13:15, H16

Photonic integrated circuits with on-chip single-photon emitters based on III-V semiconductors — •Mario Schwartz, Ulrich Rengstl, Thomas Herzog, Matthias Paul, Jan Kettler, Simone Luca Portalupi, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Research Center SCoPE and IQST, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

In quantum photonics the full on-chip integration of major optical components, like beamsplitters, single-photon sources and detectors are currently one of the main goals. Here, we present our progress on the implementation of InAs quantum dots as single photon sources in on-chip rib GaAs/AlGaAs waveguide structures. An on-chip evanescent field coupler is shown to act as a 50:50 beamsplitter for single photons, generated by pumping an integrated quantum dot quasi-resonantly and resonantly in order to improve the coherent properties of the emitted photons. The purity of the single photon emission is verified under quasi-resonant and resonant continues wave excitation, by directly measuring the photon correlations at the output arms of the on-chip beamsplitter. Especially for pulsed resonant excitation, we demonstrate that the hurdle of strong laser stray light can be overcome by carefully adjusted laser excitation pulses enabling nearly background free, triggered single-photon emission. This manifests in the observation of clear Rabi oscillations over two periods of the quantum dot emission as a function of laser excitation power. The present results open exciting new perspectives for fully integrated quantum circuits.