Universal control of a six-qubit quantum processor in silicon

Stephan G. J. Philips, Mateusz T. Mądzik, Sergey V. Amitonov, Sander L. Snoo, Maximilian Russ, Nima Kalhor, Christian Volk, William I. L. Lawrie, Delphine Brousse, Larysa Tryputen, Brian Paquelet Wuetz, Amir Sammak, Menno Veldhorst, Giordano Scappucci and Lieven M. K. Vandersypen ()
Additional contact information
Stephan G. J. Philips: Delft University of Technology
Mateusz T. Mądzik: Delft University of Technology
Sergey V. Amitonov: Delft University of Technology
Sander L. Snoo: Delft University of Technology
Maximilian Russ: Delft University of Technology
Nima Kalhor: Delft University of Technology
Christian Volk: Delft University of Technology
William I. L. Lawrie: Delft University of Technology
Delphine Brousse: QuTech and Netherlands Organization for Applied Scientific Research (TNO)
Larysa Tryputen: QuTech and Netherlands Organization for Applied Scientific Research (TNO)
Brian Paquelet Wuetz: Delft University of Technology
Amir Sammak: QuTech and Netherlands Organization for Applied Scientific Research (TNO)
Menno Veldhorst: Delft University of Technology
Giordano Scappucci: Delft University of Technology
Lieven M. K. Vandersypen: Delft University of Technology

Nature, 2022, vol. 609, issue 7929, 919-924

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41586-022-05117-x

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