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

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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Authors

Hamonic P; Toubeix M; Haas G; Nath J; Dartiailh MC; Martinez B; Bertrand B; Niebojewski H; Vinet M; Bäuerle C; Balestro F; Meunier T; Urdampilleta M

Published

Jan 1, 2026

Journal or venue

Nature electronics

DOI

10.1038/s41928-026-01654-9

Paper type

journal article

Source

Pubmed