Cavity-enhanced single-shot readout of a quantum dot spin within 3 nanoseconds

Nadia O. Antoniadis, Mark R. Hogg (), Willy F. Stehl, Alisa Javadi, Natasha Tomm, Rüdiger Schott, Sascha R. Valentin, Andreas D. Wieck, Arne Ludwig and Richard J. Warburton ()
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Nadia O. Antoniadis: University of Basel
Mark R. Hogg: University of Basel
Willy F. Stehl: University of Basel
Alisa Javadi: University of Basel
Natasha Tomm: University of Basel
Rüdiger Schott: Ruhr-Universität Bochum
Sascha R. Valentin: Ruhr-Universität Bochum
Andreas D. Wieck: Ruhr-Universität Bochum
Arne Ludwig: Ruhr-Universität Bochum
Richard J. Warburton: University of Basel

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Rapid, high-fidelity single-shot readout of quantum states is a ubiquitous requirement in quantum information technologies. For emitters with a spin-preserving optical transition, spin readout can be achieved by driving the transition with a laser and detecting the emitted photons. The speed and fidelity of this approach is typically limited by low photon collection rates and measurement back-action. Here we use an open microcavity to enhance the optical readout signal from a semiconductor quantum dot spin state, largely overcoming these limitations. We achieve single-shot readout of an electron spin in only 3 nanoseconds with a fidelity of (95.2 ± 0.7)%, and observe quantum jumps using repeated single-shot measurements. Owing to the speed of our readout, errors resulting from measurement-induced back-action have minimal impact. Our work reduces the spin readout-time well below both the achievable spin relaxation and dephasing times in semiconductor quantum dots, opening up new possibilities for their use in quantum technologies.

Date: 2023
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DOI: 10.1038/s41467-023-39568-1

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