Controlled quantum dot array segmentation via a highly tunable interdot tunnel coupling

• Published in: arXiv.org 2022-07
• Main Authors: Nurizzo, Martin, Jadot, Baptiste, Pierre-André Mortemousque, Thiney, Vivien, Chanrion, Emmanuel, Dartiailh, Matthieu, Ludwig, Arne, Wieck, Andreas D, Bäuerle, Christopher, Urdampilleta, Matias, Meunier, Tristan
• Format: Article
• Language: English
• Subjects: Arrays; Control systems; Coupling; Electron spin; Quantum computing; Quantum dots; Qubits (quantum computing); Segmentation; Tuning; Tunnels; Unit cell
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2207.09235

Recent demonstrations using electron spins stored in quantum dots array as qubits are promising for developing a scalable quantum computing platform. An ongoing effort is therefore aiming at the precise control of the quantum dots parameters in larger and larger arrays which represents a complex challenge. Partitioning of the system with the help of the inter-dot tunnel barriers can lead to a simplification for tuning and offers a protection against unwanted charge displacement. In a triple quantum dot system, we demonstrate a nanosecond control of the inter-dot tunnel rate permitting to reach the two extreme regimes, large GHz tunnel coupling and sub-Hz isolation between adjacent dots. We use this novel development to isolate a sub part of the array while performing charge displacement and readout in the rest of the system. The degree of control over the tunnel coupling achieved in a unit cell should motivate future protocol development for tuning, manipulation and readout including this capability.