Qubits based on crystal defect centers have been shown to exhibit long spin coherence times, up to seconds at room temperature. However, they are typically characterized by a comparatively slow initialization timescale. Here, fluorine implantation into ZnSe epilayers is used to induce defect states that are identified as zinc vacancies. We study the carrier spin relaxation in these samples using various pump-probe measurement methods, assessing phenomena such as resonant spin amplification, polarization recovery, and spin inertia in transverse or longitudinal magnetic field. The spin dynamics in isotopically natural ZnSe show a significant influence of the nuclear spin bath. Removing this source of relaxation by using isotopic purification, we isolate the anisotropic exchange interaction as the main spin dephasing mechanism and find spin coherence times of 100 ns at room temperature, with the possibility of fast optical access on the picosecond time scales through excitonic transitions of ZnSe.

基于晶体缺陷中心的量子位已被证明具有很长的自旋相干时间，在室温下可达数秒。然而，它们的典型特征是初始化时间相对较慢。在这里，氟注入 ZnSe 外延层用于诱导缺陷状态，即锌空位。我们使用各种泵浦探针测量方法研究这些样品中的载流子自旋弛豫，评估共振自旋放大、极化恢复和横向或纵向磁场中的自旋惯性等现象。同位素天然 ZnSe 中的自旋动力学显示出核自旋浴的显着影响。通过使用同位素纯化去除这种松弛源，