Single-shot in situ readout of a spin qubit unit cell

Abstract Spin qubits based on semiconductor quantum dots can offer high coherence times and gate fidelities, and are a potential platform for quantum computation. However, scaling up the number of qubits to the level required for fault-tolerant quantum computing is challenging and will require single-shot, low-footprint qubit readout. Here we report single-shot readout of a spin qubit unit cell using in situ dispersive readout. Our compact, foundry-fabricated unit cell is composed of two electron spins with a controllable exchange interaction, and with it we demonstrate initialization, single-shot readout and a two-electron entangling gate. From exchange oscillations, we extract a spin visibility of 80.7(8)% in the coherent control of a qubit, despite a relatively small lever arm to the resonator gate (less than 0.15(5) eV V −1 ). We show that the unit cell can be operated at up to 1 K with low charge noise levels, extracted using free induction decay.

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Publication Details

Journal
Nature Electronics
Published
2026-06-17
DOI
https://doi.org/10.1038/s41928-026-01654-9
Primary Topic
Quantum and electron transport phenomena
Type
article
Field-Weighted Citation Impact
0.00

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article

Single-shot in situ readout of a spin qubit unit cell

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Nature Electronics
Quantum and electron transport phenomena
article

Single-shot in situ readout of a spin qubit unit cell

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article en

Abstract

Abstract Spin qubits based on semiconductor quantum dots can offer high coherence times and gate fidelities, and are a potential platform for quantum computation. However, scaling up the number of qubits to the level required for fault-tolerant quantum computing is challenging and will require single-shot, low-footprint qubit readout. Here we report single-shot readout of a spin qubit unit cell using in situ dispersive readout. Our compact, foundry-fabricated unit cell is composed of two electron spins with a controllable exchange interaction, and with it we demonstrate initialization, single-shot readout and a two-electron entangling gate. From exchange oscillations, we extract a spin visibility of 80.7(8)% in the coherent control of a qubit, despite a relatively small lever arm to the resonator gate (less than 0.15(5) eV V −1 ). We show that the unit cell can be operated at up to 1 K with low charge noise levels, extracted using free induction decay.

Nature Electronics
Institut polytechnique de Grenoble (FR), Centre National de la Recherche Scientifique (FR), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), CEA Grenoble (FR), Institut Néel (FR), Laboratoire d'Électronique des Technologies de l'Information (FR), Université Grenoble Alpes (FR)
Agence Nationale de la Recherche
Openalex Percentile: Top 7%
Quantum and electron transport phenomena
DOIOpen Access PDFOpenAlex
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