标题： 室温下由NV自旋子系光栅多次重相位引起的超辐射回声 显示英文标题

标题： Superradiant Echoes Induced by Multiple Re-phasing of NV Spin Sub-ensembles Grating at Room Temperature

摘要： 在本信中，我们提出通过将激光照射和微波Hahn回波序列应用于放置在介电微波腔中的高浓度氮空位（NV）中心的金刚石，可以在室温下实现超辐射回声。 我们确定两个微波驱动脉冲和自由演化的共同作用在频率空间中对NV自旋子系施加了一个相位光栅，并且经过多次重新相位的光栅化自旋子系通过与腔体的集体耦合导致了多次超辐射回声。 此外，我们表明可以通过修改光栅参数，利用微波脉冲和激光照射主动调节超辐射回声，多次重新相位的动力学类似于光学钟系统中导致超辐射拍频的动力学。 在未来，可以通过动态解耦进一步优化自旋子系光栅和产生的回声，这可能为量子传感的应用铺平道路。 显示英文摘要

摘要： In this Letter, we propose that superradiant echoes can be achieved at room temperature by applying a laser illumination and a microwave Hahn echo sequence to a diamond with a high concentration of nitrogen-vacancy (NV) centers placed in a dielectric microwave cavity. We identify that the combined action of two microwave driving pulses and a free evolution imprints a phase grating among NV spin sub-ensembles in frequency space, and multiple re-phasing of the grated spin sub-ensembles leads to multiple superradiant echoes through a collective coupling with the cavity. Furthermore, we show that the superradiant echoes can be actively tailored with the microwave pulses and the laser illumination by modifying the grating parameters, and the multiple re-phasing dynamics is analogous to the one leading to superradiant beats in optical clock system. In the future, the spin sub-ensembles grating and the resulting echoes can be further optimized with dynamical decoupling, which might pave the way for applications in quantum sensing.