Print Email Facebook Twitter Shared control of a 16 semiconductor quantum dot crossbar array Title Shared control of a 16 semiconductor quantum dot crossbar array Author Borsoi, F. (TU Delft QCD/Veldhorst Lab; Kavli institute of nanoscience Delft; QuTech) Hendrickx, N.W. (TU Delft QCD/Veldhorst Lab; Kavli institute of nanoscience Delft; QuTech) John, V. (TU Delft QCD/Veldhorst Lab; Kavli institute of nanoscience Delft; QuTech) Meyer, M. (TU Delft QCD/Veldhorst Lab; Kavli institute of nanoscience Delft; QuTech) Motz, Sayr (Kavli institute of nanoscience Delft; Student TU Delft; QuTech) van Riggelen, F. (TU Delft QCD/Veldhorst Lab; Kavli institute of nanoscience Delft; QuTech) Sammak, A. (TU Delft BUS/TNO STAFF; QuTech) de Snoo, S.L. (TU Delft QCD/Vandersypen Lab; Kavli institute of nanoscience Delft; QuTech) Scappucci, G. (TU Delft QCD/Scappucci Lab; Kavli institute of nanoscience Delft; QuTech) Veldhorst, M. (TU Delft QN/Veldhorst Lab; Kavli institute of nanoscience Delft; QuTech) Date 2023 Abstract The efficient control of a large number of qubits is one of the most challenging aspects for practical quantum computing. Current approaches in solid-state quantum technology are based on brute-force methods, where each and every qubit requires at least one unique control line—an approach that will become unsustainable when scaling to the required millions of qubits. Here, inspired by random-access architectures in classical electronics, we introduce the shared control of semiconductor quantum dots to efficiently operate a two-dimensional crossbar array in planar germanium. We tune the entire array, comprising 16 quantum dots, to the few-hole regime. We then confine an odd number of holes in each site to isolate an unpaired spin per dot. Moving forward, we demonstrate on a vertical and a horizontal double quantum dot a method for the selective control of the interdot coupling and achieve a tunnel coupling tunability over more than 10 GHz. The operation of a quantum electronic device with fewer control terminals than tunable experimental parameters represents a compelling step forward in the construction of scalable quantum technology. To reference this document use: http://resolver.tudelft.nl/uuid:a6f5036b-a43e-4894-a108-523e29f6f570 DOI https://doi.org/10.1038/s41565-023-01491-3 ISSN 1748-3387 Source Nature Nanotechnology, 19 (1), 21-27 Part of collection Institutional Repository Document type journal article Rights © 2023 F. Borsoi, N.W. Hendrickx, V. John, M. Meyer, Sayr Motz, F. van Riggelen, A. Sammak, S.L. de Snoo, G. Scappucci, M. Veldhorst Files PDF s41565_023_01491_3.pdf 2 MB Close viewer /islandora/object/uuid:a6f5036b-a43e-4894-a108-523e29f6f570/datastream/OBJ/view