Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 2: Spin Phenomena in Semiconductors
HL 2.5: Vortrag
Montag, 5. September 2022, 10:45–11:00, H31
Cavity-enhanced single-shot readout of a quantum dot spin within 3 ns — •Nadia Olympia Antoniadis1, Mark Richard Hogg1, Willy Frederik Stehl1, Alisa Javadi1, Natasha Tomm1, Rüdiger Schott2, Sascha René Valentin2, Andreas Dirk Wieck2, Arne Ludwig2, and Richard John Warburton1 — 1Department of Physics, University of Basel — 2Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum
Rapid, high-fidelity single-shot readout of quantum states is a ubiquitous requirement in quantum information technologies. Readout of spin states in optically active emitters can be achieved by driving a spin-preserving optical transition and detecting the emitted photons. The speed and fidelity of this approach is typically limited by a combination of low photon collection rates and measurement back-action. Here, we demonstrate single-shot optical readout of a semiconductor quantum dot spin state, achieving a readout time of only a few nanoseconds. Our approach embeds a gated InAs quantum dot device into an open microcavity architecture. The Purcell enhancement generated by the microcavity selectively increases the readout transition emission rate, as well as efficiently channelling the emitted photons into a well-defined detection mode. We achieve single-shot readout of an electron spin state in 3 ns with a fidelity of (95.85±0.71)%, and observe quantum jumps using repeated single-shot measurements. Our work reduces the spin readout-time to values well below both the achievable spin T1 and T2* times in InAs quantum dots, opening up new possibilities for their use in quantum technologies.