Universal control of a six-qubit quantum processor in silicon

Philips, Stephan G. J.; Mądzik, Mateusz T.; Amitonov, Sergey V.; de Snoo, Sander L.; Russ, Maximilian; Kalhor, Nima; Volk, Christian; Lawrie, William L.; Brousse, Delphine; Tryputen, Larysa; Wuetz, Brian Paquelet; Sammak, Amir; Veldhorst, Menno; Scappucci, Giordano; Vandersypen, Lieven M. K.

doi:10.1038/s41586-022-05117-x

Universal control of a six-qubit quantum processor in silicon

Journal Article · Wed Sep 28 00:00:00 EDT 2022 · Nature (London)

DOI:https://doi.org/10.1038/s41586-022-05117-x· OSTI ID:1904681

Philips, Stephan G. J. ^[1]; ^[2]; Amitonov, Sergey V. ^[2]; ^[2]; ^[2]; Kalhor, Nima ^[2]; ^[2]; ^[2]; Brousse, Delphine ^[3]; Tryputen, Larysa ^[3]; ^[2]; Sammak, Amir ^[3]; ^[2]; ^[2]; ^[2]

Delft University of Technology (Netherlands). Kavli Institute of Nanoscience; Delft Univ. of Technology (Netherlands)
Delft University of Technology (Netherlands). Kavli Institute of Nanoscience
Delft University of Technology (Netherlands)

Future quantum computers capable of solving relevant problems will require a large number of qubits that can be operated reliably. 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 promise 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 readout. 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.

View Accepted Manuscript (DOE)

Research Organization:: Delft University of Technology (Netherlands); University of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: Army Research Office (ARO); Keysight’s University Research Collaborations; Marie Skłodowska-Curie; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-03ER46028

OSTI ID:: 1904681

Journal Information:: Nature (London), Journal Name: Nature (London) Journal Issue: 7929 Vol. 609; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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