학술논문
Robust multi-qubit quantum network node with integrated error detection
Document Type
Working Paper
Author
Stas, Pieter-Jan; Huan, Yan Qi; Machielse, Bartholomeus; Knall, Erik N.; Suleymanzade, Aziza; Pingault, Benjamin; Sutula, Madison; Ding, Sophie W.; Knaut, Can M.; Assumpcao, Daniel R.; Wei, Yan-Cheng; Bhaskar, Mihir K.; Riedinger, Ralf; Sukachev, Denis D.; Park, Hongkun; Lončar, Marko; Levonian, David S.; Lukin, Mikhail D.
Source
Subject
Language
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 29Si nuclear spin acting as a memory qubit with a quantum memory time exceeding two seconds. By using a highly strained SiV with suppressed electron spin-phonon interactions, we realize electron-photon entangling gates at elevated temperatures up to 1.5 K and nucleus-photon entangling gates up to 4.3 K. Finally, we 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.
Comment: 24 pages, 19 figures
Comment: 24 pages, 19 figures