Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 26: Quantum Dots and Wires 5: Optics 2
HL 26.6: Talk
Thursday, September 8, 2022, 10:45–11:00, H32
GaAs Droplet Epitaxy Quantum Dots as Deterministic Single Photon Sources for Entangling SiV-Centers in Diamond — •Manuel Rieger1, Viviana Villafane1, Andreas Nickl1, Christian Dangel1, Hans-Georg Babin2, Tim Schröder3, Arne Ludwig2, Andreas Wieck2, Kai Müller1, and Jonathan Finley1 — 1Walter Schottky Institut/Physik Department, TUM, 85748 Garching, Germany — 2Physik Department, RU Bochum, Universitätsstraße 150, 44801 Bochum, Germany — 3Physik Department, HU Berlin, Newtonstraße 15, 12489 Berlin, Germany
Quantum algorithms promise acceleration of tasks like computational chemistry and machine learning. In this context, diamond-based quantum hardware capable of interfacing spins and photons in a scalable network [1] is particularly advantageous since it combines excellent coherence times, gate fidelities and the possibility for on-chip integration. We demonstrate GaAs based quantum dot (QD) deterministic single photon sources grown using droplet epitaxy (DE) and resonant with the the SiV- center in diamond at 737nm. By characterizing single dots using low temperature optical spectroscopy, we measure a non-classical second order photon intensity correlation function (g2(0)<0.3), demonstrate electrical tunability of the charge occupancy and show wide tunability of the emission frequency over 250GHz. Furthermore, we show that the optical lifetimes of the DE-QDs lie in the range 1-1.5ns, similar to those of SiV− (1-2ns), a prerequisite for high-fidelity photon mediated entanglement [1,2]. [1] K. Nemoto et al., Phys. Rev. X (2014). [2] C. Dangel et al., arXiv preprint (2022).