论文标题
六角硼氮化硼的室温相干控制
Room temperature coherent control of protected qubit in hexagonal boron nitride
论文作者
论文摘要
六角硼硝化硼箔中的自旋缺陷是磁场成像的有吸引力的平台，因为探针可以靠近靶标。但是，作为III-V材料，电子自旋连贯性受核自旋环境的限制，在室温可访问的磁场下，自旋回声相干时间为$ \ sim100〜 \ mathrm {ns} $。我们使用具有调制的强连续微波驱动器来稳定Rabi振荡，将连贯性时间延长至$ \ sim4〜 \ Mathrm {μs} $，该$接近10 - $ \ MATHRM {μs} $ Electron Spin in Pamples中。然后，我们定义一个受保护的量子基础，并显示对受保护量子的完全控制。受保护量子的叠加的相干时间可以高达$ 0.8〜 \ mathrm {μs} $。这项工作确定，在六角形的氮化硼中硼的空位可以具有电子旋转相干时间，在环境条件下，小纳米座中的典型NV中心具有竞争力。
Spin defects in foils of hexagonal boron nitride are an attractive platform for magnetic field imaging, since the probe can be placed in close proximity to the target. However, as a III-V material the electron spin coherence is limited by the nuclear spin environment, with spin echo coherence time of $\sim100~\mathrm{ns}$ at room temperature accessible magnetic fields. We use a strong continuous microwave drive with a modulation in order to stabilize a Rabi oscillation, extending the coherence time up to $\sim4~\mathrm{μs}$, which is close to the 10-$\mathrm{μs}$ electron spin lifetime in our sample. We then define a protected qubit basis, and show full control of the protected qubit. The coherence times of a superposition of the protected qubit can be as high as $0.8~\mathrm{μs}$. This work establishes that boron vacancies in hexagonal boron nitride can have electron spin coherence times that are competitive with typical NV-centers in small nanodiamonds under ambient conditions.
