A zero-field protocol for 117SnV- color centers keeps the nuclear memory qubit insensitive to optical excitation, demonstrated with high-fidelity microwave control in a photonic integrated circuit.
Robust multi-qubit quantum network node with integrated error detection
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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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High-Fidelity Control of a Strongly Coupled Electro-Nuclear Spin-Photon Interface
A zero-field protocol for 117SnV- color centers keeps the nuclear memory qubit insensitive to optical excitation, demonstrated with high-fidelity microwave control in a photonic integrated circuit.