Robust multi-qubit quantum network node with integrated error detection

Journal article (2022)

Authors

P. J. Stas Harvard University
Y. Huan Harvard University
Bartholomeus Machielse Amazon AWS, Harvard University
E. N. Knall Harvard School of Engineering and Applied Sciences
A. Suleymanzade Harvard University
Benjamin Pingault QID/Taminiau Lab - QuTech Advanced Research Centre , Harvard University, QuTech Advanced Research Centre, Kavli institute of nanoscience Delft
M. Sutula Harvard University
S. W. Ding Harvard University
C.M. Knaut Harvard University
More Authors... External organisation
Research Group
QID/Taminiau Lab (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2022 P. J. Stas, Y. Huan, B. Machielse, E. N. Knall, A. Suleymanzade, B.J. Pingault, M. Sutula, S. W. Ding, C.M. Knaut, More Authors
DOI: https://doi.org/10.1126/science.add9771
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Published Date

2022

Language

English

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Faculty

QuTech Advanced Research Centre

Department

Quantum Internet Division

Research Group

QID/Taminiau Lab

Abstract

Long-distance quantum communication and networking require quantum memory nodes with efficient optical interfaces and long memory times. We report the realization of an integrated two-qubit network node based on silicon-vacancy centers (SiVs) in diamond nanophotonic cavities. Our qubit register consists of the SiV electron spin acting as a communication qubit and the strongly coupled silicon-29 nuclear spin acting as a memory qubit with a quantum memory time exceeding 2 seconds. By using a highly strained SiV, we realize electron-photon entangling gates at temperatures up to 1.5 kelvin and nucleus-photon entangling gates up to 4.3 kelvin. We also demonstrate efficient error detection in nuclear spin–photon gates by using the electron spin as a flag qubit, making this platform a promising candidate for scalable quantum repeaters.

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