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

IF 42.3 1区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

Nature Electronics Pub Date : 2026-06-17 DOI:10.1038/s41928-026-01654-9

Pierre Hamonic, Mathieu Toubeix, Guillermo Haas, Jayshankar Nath, Matthieu C. Dartiailh, Biel Martinez, Benoit Bertrand, Heimanu Niebojewski, Maud Vinet, Christopher Bäuerle, Franck Balestro, Tristan Meunier, Matias Urdampilleta

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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. The state of a foundry-fabricated spin qubit unit cell, which is composed of two electron spins with a controllable exchange interaction, can be read out in a single shot using gate reflectometry.

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自旋量子位元单元的单次原位读出

基于半导体量子点的自旋量子比特可以提供高相干时间和门保真度，是量子计算的潜在平台。然而，将量子位的数量扩大到容错量子计算所需的水平是具有挑战性的，并且需要单次、低占用空间的量子位读出。在这里，我们报告了使用原位色散读出的自旋量子位单元细胞的单次读出。我们的紧凑，铸造制造的单元电池由两个电子自旋组成，具有可控的交换相互作用，并利用它演示了初始化，单次读出和双电子纠缠门。从交换振荡中，尽管谐振器门的杠杆臂相对较小（小于0.15(5)eV V−1），但在量子比特的相干控制中，我们提取了80.7(8)%的自旋可见性。我们表明，该单元电池可以在高达1k的低电荷噪声水平下工作，使用自由感应衰减提取。

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来源期刊

Nature Electronics Engineering-Electrical and Electronic Engineering

CiteScore

47.50

自引率

2.30%

发文量

159

期刊介绍： Nature Electronics is a comprehensive journal that publishes both fundamental and applied research in the field of electronics. It encompasses a wide range of topics, including the study of new phenomena and devices, the design and construction of electronic circuits, and the practical applications of electronics. In addition, the journal explores the commercial and industrial aspects of electronics research. The primary focus of Nature Electronics is on the development of technology and its potential impact on society. The journal incorporates the contributions of scientists, engineers, and industry professionals, offering a platform for their research findings. Moreover, Nature Electronics provides insightful commentary, thorough reviews, and analysis of the key issues that shape the field, as well as the technologies that are reshaping society. Like all journals within the prestigious Nature brand, Nature Electronics upholds the highest standards of quality. It maintains a dedicated team of professional editors and follows a fair and rigorous peer-review process. The journal also ensures impeccable copy-editing and production, enabling swift publication. Additionally, Nature Electronics prides itself on its editorial independence, ensuring unbiased and impartial reporting. In summary, Nature Electronics is a leading journal that publishes cutting-edge research in electronics. With its multidisciplinary approach and commitment to excellence, the journal serves as a valuable resource for scientists, engineers, and industry professionals seeking to stay at the forefront of advancements in the field.