Stern Hannah L, M Gilardoni Carmem, Gu Qiushi, Eizagirre Barker Simone, Powell Oliver F J, Deng Xiaoxi, Fraser Stephanie A, Follet Louis, Li Chi, Ramsay Andrew J, Tan Hark Hoe, Aharonovich Igor, Atatüre Mete
Cavendish Laboratory, University of Cambridge, Cambridge, UK.
Photon Science Institute and Department of Physics and Department of Chemistry, The University of Manchester, Manchester, UK.
Nat Mater. 2024 Oct;23(10):1379-1385. doi: 10.1038/s41563-024-01887-z. Epub 2024 May 20.
Solid-state spin-photon interfaces that combine single-photon generation and long-lived spin coherence with scalable device integration-ideally under ambient conditions-hold great promise for the implementation of quantum networks and sensors. Despite rapid progress reported across several candidate systems, those possessing quantum coherent single spins at room temperature remain extremely rare. Here we report quantum coherent control under ambient conditions of a single-photon-emitting defect spin in a layered van der Waals material, namely, hexagonal boron nitride. We identify that the carbon-related defect has a spin-triplet electronic ground-state manifold. We demonstrate that the spin coherence is predominantly governed by coupling to only a few proximal nuclei and is prolonged by decoupling protocols. Our results serve to introduce a new platform to realize a room-temperature spin qubit coupled to a multiqubit quantum register or quantum sensor with nanoscale sample proximity.
固态自旋-光子界面将单光子产生、长寿命自旋相干与可扩展的器件集成相结合——理想情况下是在环境条件下——这为量子网络和传感器的实现带来了巨大希望。尽管在几个候选系统中都有快速进展的报道，但在室温下拥有量子相干单自旋的系统仍然极为罕见。在此，我们报道了在环境条件下对层状范德华材料（即六方氮化硼）中一个单光子发射缺陷自旋的量子相干控制。我们确定与碳相关的缺陷具有自旋三重态电子基态流形。我们证明自旋相干主要由与仅几个近端原子核的耦合所支配，并通过去耦协议得以延长。我们的结果有助于引入一个新平台，以实现与具有纳米级样品接近度的多量子比特量子寄存器或量子传感器耦合的室温自旋量子比特。
