Print Email Facebook Twitter A crossbar network for silicon quantum dot qubits Title A crossbar network for silicon quantum dot qubits Author Li, R. (TU Delft QCD/Veldhorst Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Petit, L. (TU Delft QCD/Veldhorst Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Franke, D.P. (TU Delft QCD/Veldhorst Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Dehollain Lorenzana, J.P. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Helsen, J. (TU Delft Quantum Information and Software; TU Delft QuTech Advanced Research Centre) Steudtner, M. (TU Delft QID/Wehner Group; TU Delft QuTech Advanced Research Centre; Universiteit Leiden) Thomas, Nicole K. (Intel Labs) Wehner, S.D.C. (TU Delft Quantum Internet Division; TU Delft Quantum Information and Software; TU Delft QuTech Advanced Research Centre) Vandersypen, L.M.K. (TU Delft QCD/Vandersypen Lab; TU Delft QN/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Intel Labs; Kavli institute of nanoscience Delft) Veldhorst, M. (TU Delft QCD/Veldhorst Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Department Quantum Internet Division Date 2018-07 Abstract The spin states of single electrons in gate-defined quantum dots satisfy crucial requirements for a practical quantum computer. These include extremely long coherence times, high-fidelity quantum operation, and the ability to shuttle electrons as a mechanism for on-chip flying qubits. To increase the number of qubits to the thousands or millions of qubits needed for practical quantum information, we present an architecture based on shared control and a scalable number of lines. Crucially, the control lines define the qubit grid, such that no local components are required. Our design enables qubit coupling beyond nearest neighbors, providing prospects for nonplanar quantum error correction protocols. Fabrication is based on a three-layer design to define qubit and tunnel barrier gates. We show that a double stripline on top of the structure can drive high-fidelity single-qubit rotations. Self-aligned inhomogeneous magnetic fields induced by direct currents through superconducting gates enable qubit addressability and readout. Qubit coupling is based on the exchange interaction, and we show that parallel two-qubit gates can be performed at the detuning-noise insensitive point. While the architecture requires a high level of uniformity in the materials and critical dimensions to enable shared control, it stands out for its simplicity and provides prospects for large-scale quantum computation in the near future. To reference this document use: http://resolver.tudelft.nl/uuid:fb4f220f-2b6d-4e3a-91a5-5b8439e43a50 DOI https://doi.org/10.1126/sciadv.aar3960 ISSN 2375-2548 Source Science Advances, 4 (7) Part of collection Institutional Repository Document type journal article Rights © 2018 R. Li, L. Petit, D.P. Franke, J.P. Dehollain Lorenzana, J. Helsen, M. Steudtner, Nicole K. Thomas, S.D.C. Wehner, L.M.K. Vandersypen, M. Veldhorst Files PDF eaar3960.full.pdf 1.13 MB Close viewer /islandora/object/uuid:fb4f220f-2b6d-4e3a-91a5-5b8439e43a50/datastream/OBJ/view