Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 39: Focus Session: Quantum Nanophotonics in Solid State Systems I (joint session HL/TT)

TT 39.5: Invited Talk

Tuesday, March 13, 2018, 11:15–11:45, EW 201

Integrated III-V nonlinear quantum optical devices — •Gregor Weihs — Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria

For fundamental tests of quantum physics as well as for quantum communications, non-classical states of light are an important tool. In this talk, we will present our work on nonlinear AlGaAs waveguides. Most III-V semiconductors exhibit a large second-order optical nonlinearity, but phase-matching the nonlinear interaction is notoriously difficult. As a solution Bragg-reflection waveguides (BRW) allow efficient creation of photon pairs through spontaneous parametric down-conversion. They have the potential to be integrated with a pump laser on the chip for a miniaturized room-temperature entangled photon pair source.

In our BRWs we can create high-fidelity polarization and time-bin entangled photon pairs, which cover a large frequency band in the low-loss telecommunication window, suitable for serving multiple users through wavelength division multiplexing. For all our applications it is important that we can design the desired linear and nonlinear properties, which in turn makes precise characterization necessary. For this purpose we have developed a Fourier-transform Fabry-Perot spectroscopy technique, which yields the relevant device parameters with superior accuracy. Finally, we will present our latest results on devices that integrate electrically injected lasers and the nonlinear conversion and give an outlook on the possible integration of other optical elements on-chip.