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Q: Fachverband Quantenoptik und Photonik

Q 30: QuanTour III – Spin Physics & Coherence

Q 30.1: Invited Talk

Wednesday, March 4, 2026, 14:30–15:00, P 1

Shedding light on nuclear spins: from collective states to a quantum memory — •Mete Atature — Cavendish Laboratory, University of Cambridge

Optically active spins in solids are strong candidates for scalable devices towards quantum networks. Semiconductor quantum dots set the state-of-the-art as single-photon sources with high level tuneability, brightness, and indistinguishability. In parallel, their inherently mesoscopic nature leads to a unique realisation of a tripartite interface between light as information carrier, an electron spin as a proxy qubit, and an isolated nuclear spin ensemble. The ability to control these constituents and their mutual interactions create opportunities to realize an optically controllable ensemble of ~50,000 spins. The talk will take a journey from treating the quantum dot nuclei as an uncontrolled noise source limiting spin coherence to the observation of their collective magnon modes and eventually to their function as a quantum register, all witnessed via a single electron spin driven by light.