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Measuring and Correcting Nanosecond Pulse Distortions in Quantum-Dot Spin Qubits

Jiheng Duan*, Fernando Torres-Leal*, and John M. Nichol†

  • Department of Physics and Astronomy, University of Rochester, Rochester, New York, 14627, USA and University of Rochester Center for Coherence and Quantum Science, Rochester, New York, 14627, USA

  • *These authors contributed equally to this work.
  • †Contact author: john.nichol@rochester.edu
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Phys. Rev. Lett. 137, 113601 – Published 9 September, 2026

DOI: https://doi.org/10.1103/l5k6-csy3

Abstract

Gate-defined semiconductor quantum dots utilize fast electrical control to manipulate spin and charge states of individual electrons. Electrical pulse distortions can limit control fidelities but are difficult to measure at the device level. Here, we use detuning-axis pulsed spectroscopy to characterize baseband pulse distortions in a silicon double quantum dot. We extract the gate-voltage impulse response and apply a digital predistortion filter to eliminate pulse distortions on timescales longer than 1 ns. With the predistortion, we reduce the frequency chirp of coherent exchange oscillations in a singlet-triplet qubit. Our results suggest a scalable and tuning-efficient method for characterizing pulse distortions in quantum-dot spin qubits.

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Phys. Rev. Lett. 137, 113601– Published 9 September, 2026
  • Received 4 March 2026
  • Accepted 11 August 2026
Article part of CHORUS
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