Robust multi-qubit quantum network node with integrated error detection
- URL: http://arxiv.org/abs/2207.13128v1
- Date: Tue, 26 Jul 2022 18:14:32 GMT
- Title: Robust multi-qubit quantum network node with integrated error detection
- Authors: Pieter-Jan Stas, Yan Qi Huan, Bartholomeus Machielse, Erik N. Knall,
Aziza Suleymanzade, Benjamin Pingault, Madison Sutula, Sophie W. Ding, Can M.
Knaut, Daniel R. Assumpcao, Yan-Cheng Wei, Mihir K. Bhaskar, Ralf Riedinger,
Denis D. Sukachev, Hongkun Park, Marko Lon\v{c}ar, David S. Levonian, Mikhail
D. Lukin
- Abstract summary: 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.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- 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.
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