Fast high-fidelity single-shot readout of spins in silicon using a single-electron box

A., Oakes, G.; Ciriano-Tejel, V. N.; Wise, D.; Fogarty, M. A.; Lundberg, T.; Lainé, C.; Schaal, S.; Martins, F.; Ibberson, D. J.; Hutin, L.; Bertrand, B.; Stelmashenko, N.; Robinson, J. A. W.; Ibberson, L.; Hashim, A.; Siddiqi, I.; Lee, A.; Vinet, M.; Smith, C. G.; Morton, John J. L.; González-Zalba, M. Fernando

doi:10.48550/arxiv.2203.06608

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2023

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“…Due to their potential for scalability, rf techniques play an increasingly important role in developing quantum device circuits. A recent achievement has been the highfidelity single-shot readout of spins [2][3][4]. However, until now, much slower current measurements were still necessary to automatically tune quantum devices to their operating condition [5][6][7][8], even though rf measurements are sufficient [9].…”

Section: Introductionmentioning

confidence: 99%

All rf-based tuning algorithm for quantum devices using machine learning

Ares

Straaten

Fedele

et al. 2023

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Radio-frequency measurements could satisfy DiVincenzo's readout criterion in future large-scale solid-state quantum processors, as they allow for high bandwidths and frequency multiplexing. However, the scalability potential of this readout technique can only be leveraged if quantum device tuning is performed using exclusively radio-frequency measurements, i.e. without resorting to current measurements. By exploiting their bandwidth and impedance matching, we demonstrate an algorithm that automatically tunes double quantum dots with only radio-frequency measurements. The tuning was completed within a few minutes without prior knowledge about the device architecture. Our results show that it is possible to eliminate the need for transport measurements for quantum dot tuning, paving the way for more scalable device architectures.

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