Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 39: Posters: Quantum Optics and Photonics III

Q 39.49: Poster

Wednesday, March 11, 2020, 16:30–18:30, Empore Lichthof

Building the necessary setup infrastructure for spin-photon entanglement and quantum repeaters with colour centers in silicon carbide. — •Izel Gediz, Naoya Morioka, Matthias Niethammer, Charles Babin, Di Liu, Erik Hesselmeier, Roland Nagy, Durga Dasari, Florian Kaiser, and Jörg Wrachtrup — 3rd Institute of Physics, University of Stuttgart and IQST, Stuttgart, Germany

Concerning the scalability of quantum information and networking applications, colour centers in silicon carbide (SiC) have proven to be promising candidates. The successful implementation of a quantum repeater requires a high-quality spin-photon entanglement interface.Our recent work on silicon vacancy centres in SiC showed spin-controlled indistinguishable and distinguishable photon emission through Hong-Ou-Mandel interference experiments. Here, I will show our current work on developing the necessary setup infrastructure for realising spin-photon entanglement generation. To ensure transform limited photon emission over long times, a high-finesse filter cavity was developed. A cross-polarised sub-nanosecond-pulsed excitation-emission setup was implemented to efficiently reject laser noise by more than 7 orders of magnitude. Finally, an unbalanced fibre interferometer was set up to analyse photonic time-bin quantum states. For all systems, active monitoring and stabilisation feedback is provided through a Python computer code. Our successful setup implementation paves the way for future spin-photon entanglement experiments with colour centres in an industrial semiconductor platform.