论文标题
具有集成错误检测的强大多量量子网络节点
Robust multi-qubit quantum network node with integrated error detection
论文作者
论文摘要
长距离量子通信和网络需要具有有效的光学接口和较长内存时间的量子存储节点。我们报告了基于钻石纳米光子腔中硅胶囊中心（SIV）的综合两数Qubit网络节点的实现。我们的Qubit寄存器由SIV电子旋转作为通信Qubit和强烈耦合的29SI核自旋组成，该核自旋充当记忆值，量子记忆时间超过两秒钟。 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.
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.
