论文标题

用单个稀土电子旋转感测核自旋

Sensing individual nuclear spins with a single rare-earth electron spin

论文作者

Kornher, Thomas, Xiao, Da-Wu, Xia, Kangwei, Sardi, Fiammetta, Zhao, Nan, Kolesov, Roman, Wrachtrup, Jörg

论文摘要

晶体宿主中的稀土相关电子是独特的材料系统,因为它们可以在电信带光子和长寿命自旋量子位之间提供直接接口。具体而言,它们在环境中与核自旋相互作用的固体中的光学上可访问的电子旋转是有价值的量子记忆资源。迄今为止,发现附近的单个核自旋的检测是针对少量稀释的核自旋浴宿主系统(例如钻石中的NV中心或碳化硅硅空缺)的检测,这对于宿主材料中的稀有物质来说仍然是一个开放的挑战,通常在其宿主材料中表现出密集的核自旋浴。在这里,我们介绍了Yttrium Orthosilicate主机中单个CE $^{3+} $离子的电子自旋光谱,其连贯时间为$ t_ {2} = 124 \,μ$ s。这个连贯的交互时间足够长,可以从$^{89} $ y的核自旋浴中分离近端$^{89} $ y核自旋。此外,它允许检测附近的单个$^{29} $ si核旋转,该核自旋原生于宿主材料,含量约为5%。这项研究为基于耦合的环境核自旋的稀有离子与稀有离子相关系统中的量子记忆应用打开了大门,这可能对量子误差校正方案有用。

Rare-earth related electron spins in crystalline hosts are unique material systems, as they can potentially provide a direct interface between telecom band photons and long-lived spin quantum bits. Specifically, their optically accessible electron spins in solids interacting with nuclear spins in their environment are valuable quantum memory resources. Detection of nearby individual nuclear spins, so far exclusively shown for few dilute nuclear spin bath host systems such as the NV center in diamond or the silicon vacancy in silicon carbide, remained an open challenge for rare-earths in their host materials, which typically exhibit dense nuclear spin baths. Here, we present the electron spin spectroscopy of single Ce$^{3+}$ ions in a yttrium orthosilicate host, featuring a coherence time of $T_{2}=124\,μ$s. This coherent interaction time is sufficiently long to isolate proximal $^{89}$Y nuclear spins from the nuclear spin bath of $^{89}$Y. Furthermore, it allows for the detection of a single nearby $^{29}$Si nuclear spin, native to the host material with ~5% abundance. This study opens the door to quantum memory applications in rare-earth ion related systems based on coupled environmental nuclear spins, potentially useful for quantum error correction schemes.

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