SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 10: Materials and devices for quantum technology (joint session HL/TT)
TT 10.1: Invited Talk
Wednesday, September 29, 2021, 10:00–10:30, H4
Quantum Interference of Identical Photons from Remote Quantum Dots — •Giang N. Nguyen1, Liang Zhai1, Clemens Spinnler1, Julian Ritzmann2, Matthias C. Löbl1, Andreas D. Wieck2, Arne Ludwig2, Alisa Javadi1, and Richard J. Warburton1 — 1Department of Physics, University of Basel, Switzerland — 2Lehrstuhl für Angewandte Festkörperphysik, Ruhr- Universität Bochum, Germany
Photonic quantum technology provides a viable route to quantum communication, quantum simulation, and quantum information processing. Scaling the complexity requires photonic architectures containing a large number of single photons, multiple photon-sources and photon-counters. Semiconductor quantum dots are bright and fast sources of coherent single-photons. For applications, a significant roadblock is the poor quantum coherence upon interfering single photons created by independent quantum dots.
Here, we present two-photon interference with near-unity visibility using photons from remote quantum dots. We show a Hong-Ou-Mandel visibility of 93% between photons from quantum dots separated in two cryostats. Exploiting the quantum interference, we demonstrate a photonic controlled-not circuit and a high-fidelity entanglement between photons of different origins. These results provide a long-awaited solution to the challenge of creating coherent single photons in a scalable way.