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HL: Fachverband Halbleiterphysik

HL 11: Focus Session: Quantum Emitters in 3D Semiconductors

HL 11.1: Hauptvortrag

Montag, 9. März 2026, 15:00–15:30, POT/0251

Quantum Repeater Hardware made from Silicon Carbide — •Jörg Wrachtrup — Center for Applied Quantum Technologies, University of Stuttgart

Distributing entanglement via quantum repeaters is a formidable challenge. Memory-based approaches require quantum emitters that couple strongly to optical fields, and at the same time demand stationary qubits with excellent coherence properties. Colour centres in solids meet these requirements remarkably well and are therefore leading contenders in the field. However, existing solutions are either technically demanding or result in limited network efficiency.

Silicon carbide (SiC) offers several advantages over current approaches. Most notably, SiC is a wafer-scale material with excellent nanophotonic properties and hosts defects with outstanding spin coherence. In this talk, I will highlight recent progress in incorporating colour centres into nanophotonic structures and achieving efficient photon extraction. In addition, the electron spins of these colour centres can be coupled to nuclear spin qubits with exceptional coherence properties. I will discuss this coupling and its use as quantum memories for repeaters.

Keywords: quantum emitters; quantum memory; Colour centers; coherent control; quantum repeater