A four-qubit germanium quantum processor

Nico W. Hendrickx (), William I. L. Lawrie, Maximilian Russ, Floor Riggelen, Sander L. Snoo, Raymond N. Schouten, Amir Sammak, Giordano Scappucci and Menno Veldhorst ()
Additional contact information
Nico W. Hendrickx: Delft University of Technology
William I. L. Lawrie: Delft University of Technology
Maximilian Russ: Delft University of Technology
Floor Riggelen: Delft University of Technology
Sander L. Snoo: Delft University of Technology
Raymond N. Schouten: Delft University of Technology
Amir Sammak: QuTech and Netherlands Organisation for Applied Scientific Research (TNO)
Giordano Scappucci: Delft University of Technology
Menno Veldhorst: Delft University of Technology

Nature, 2021, vol. 591, issue 7851, 580-585

Abstract: Abstract The prospect of building quantum circuits1,2 using advanced semiconductor manufacturing makes quantum dots an attractive platform for quantum information processing3,4. Extensive studies of various materials have led to demonstrations of two-qubit logic in gallium arsenide5, silicon6–12 and germanium13. However, interconnecting larger numbers of qubits in semiconductor devices has remained a challenge. Here we demonstrate a four-qubit quantum processor based on hole spins in germanium quantum dots. Furthermore, we define the quantum dots in a two-by-two array and obtain controllable coupling along both directions. Qubit logic is implemented all-electrically and the exchange interaction can be pulsed to freely program one-qubit, two-qubit, three-qubit and four-qubit operations, resulting in a compact and highly connected circuit. We execute a quantum logic circuit that generates a four-qubit Greenberger−Horne−Zeilinger state and we obtain coherent evolution by incorporating dynamical decoupling. These results are a step towards quantum error correction and quantum simulation using quantum dots.

Date: 2021
References: Add references at CitEc
Citations: View citations in EconPapers (16)

Downloads: (external link)
https://www.nature.com/articles/s41586-021-03332-6 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:591:y:2021:i:7851:d:10.1038_s41586-021-03332-6

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/s41586-021-03332-6

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().