Print Email Facebook Twitter Robust multi-qubit quantum network node with integrated error detection Title Robust multi-qubit quantum network node with integrated error detection Author Stas, P. J. (Harvard University) Huan, Y. (Harvard University) Machielse, B. (Harvard University; Amazon AWS) Knall, E. N. (Harvard School of Engineering and Applied Sciences) Suleymanzade, A. (Harvard University) Pingault, B.J. (TU Delft QID/Taminiau Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft; Harvard University) Sutula, M. (Harvard University) Ding, S. W. (Harvard University) Knaut, C.M. (Harvard University) Date 2022 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. To reference this document use: http://resolver.tudelft.nl/uuid:7099649a-32f3-456e-94ea-b2499244daee DOI https://doi.org/10.1126/science.add9771 Embargo date 2023-07-01 ISSN 0036-8075 Source Science, 378 (6619), 557-560 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 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 Files PDF science.add9771.pdf 853.85 KB Close viewer /islandora/object/uuid:7099649a-32f3-456e-94ea-b2499244daee/datastream/OBJ/view