Controlled quantum dot array segmentation via highly tunable interdot tunnel coupling

Nurizzo, M. and Jadot, B. and Mortemousque, P.-A. and Thiney, V. and Chanrion, E. and Dartiailh, M. and Ludwig, Ar. and Wieck, A.D. and Bäuerle, C. and Urdampilleta, M. and Meunier, T.

Volume: 121 Pages:
DOI: 10.1063/5.0105635
Published: 2022

Recent demonstrations using electron spins stored in quantum dot 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 dot 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 development to isolate a subpart of the array in a metastable configuration while performing charge displacement and readout in the rest of the system. The degree of control over tunnel coupling achieved in a unit cell should motivate future protocol development for tuning, manipulation, and readout including this capability. © 2022 Author(s).

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