Title
Universal control of a six-qubit quantum processor in silicon
Author
Philips, S.G.J. (TU Delft QCD/Vandersypen Lab; Kavli institute of nanoscience Delft)
Madzik, M.T. (TU Delft QCD/Vandersypen Lab; Kavli institute of nanoscience Delft)
Amitonov, S. (TU Delft BUS/TNO STAFF; Kavli institute of nanoscience Delft) 
de Snoo, S.L. (TU Delft QCD/Vandersypen Lab; Kavli institute of nanoscience Delft)
Russ, M.F. (TU Delft QCD/Vandersypen Lab; Kavli institute of nanoscience Delft)
Kalhor, N. (TU Delft BUS/Quantum Delft; Kavli institute of nanoscience Delft)
Volk, C.A. (TU Delft QCD/Vandersypen Lab; Kavli institute of nanoscience Delft)
Lawrie, W.I.L. (TU Delft QCD/Veldhorst Lab; Kavli institute of nanoscience Delft)
Brousse, D. (TU Delft BUS/TNO STAFF; TNO)
Tryputen, L. (TU Delft BUS/TNO STAFF; TNO)
Paquelet Wuetz, B. (TU Delft QCD/Scappucci Lab; Kavli institute of nanoscience Delft)
Sammak, A. (TU Delft BUS/TNO STAFF; TNO)
Veldhorst, M. (TU Delft QN/Veldhorst Lab; Kavli institute of nanoscience Delft)
Scappucci, G. (TU Delft QCD/Scappucci Lab; Kavli institute of nanoscience Delft)
Vandersypen, L.M.K. (TU Delft QuTech Advanced Research Centre; TU Delft QN/Vandersypen Lab; Kavli institute of nanoscience Delft)
Date
2022
Abstract
Future quantum computers capable of solving relevant problems will require a large number of qubits that can be operated reliably1. However, the requirements of having a large qubit count and operating with high fidelity are typically conflicting. Spins in semiconductor quantum dots show long-term promise2,3 but demonstrations so far use between one and four qubits and typically optimize the fidelity of either single- or two-qubit operations, or initialization and readout4-11. Here, we increase the number of qubits and simultaneously achieve respectable fidelities for universal operation, state preparation and measurement. We design, fabricate and operate a six-qubit processor with a focus on careful Hamiltonian engineering, on a high level of abstraction to program the quantum circuits, and on efficient background calibration, all of which are essential to achieve high fidelities on this extended system. State preparation combines initialization by measurement and real-time feedback with quantum-non-demolition measurements. These advances will enable testing of increasingly meaningful quantum protocols and constitute a major stepping stone towards large-scale quantum computers.
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DOI
https://doi.org/10.1038/s41586-022-05117-x
Source
Nature: international weekly journal of science, 609 (7929), 919-924
Part of collection
Institutional Repository
Document type
journal article
Rights
© 2022 S.G.J. Philips, M.T. Madzik, S. Amitonov, S.L. de Snoo, M.F. Russ, N. Kalhor, C.A. Volk, W.I.L. Lawrie, D. Brousse, L. Tryputen, B. Paquelet Wuetz, A. Sammak, M. Veldhorst, G. Scappucci, L.M.K. Vandersypen