Measuring and correcting nanosecond pulse distortions in quantum-dot spin qubits

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 pre-distortion filter to eliminate pulse distortions on timescales longer than 1~ns. With the pre-distortion, 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.

Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall)

arXiv:2602.17899 [quant-ph]

(or arXiv:2602.17899v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2602.17899 Focus to learn more arXiv-issued DOI via DataCite

Physical Review Letters 137.11 (2026): 113601

https://doi.org/10.1103/l5k6-csy3 Focus to learn more DOI(s) linking to related resources

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