标题： 中性氮空位中心在毫开尔文温度下的量子轨道态控制 显示英文标题

标题： Quantum Orbital-State Control of a Neutral Nitrogen-Vacancy Center at Millikelvin Temperatures

摘要： 一个中性的氮空位中心（NV$^0$）由于其大的电场灵敏度，有望实现与单个微波光子的强耦合，尽管它在5 K时容易受到环境声子噪声的影响。 将温度降低到15 mK会使轨道弛豫时间比在5 K时增加十倍。动态解耦脉冲显著地将轨道相干时间增加到约1.8$\mu$s，相比没有解耦脉冲的情况提高了30倍。 基于这些结果，当与高阻抗微波谐振器耦合时，一个单独的NV$^0$可以达到强耦合 regime，从而开启了利用金刚石中单个光学活性缺陷中心进行微波量子电动力学的可能性。 显示英文摘要

摘要： A neutral nitrogen-vacancy center (NV$^0$) is promising for realizing strong coupling with a single microwave photon due to its large electric field sensitivity, although it is susceptible to environmental phonon noise at 5 K. Decreasing the temperature to 15 mK results in a tenfold increase in orbital relaxation time compared to that at 5 K. Dynamical decoupling pulses significantly increase the orbital coherence time to around 1.8 $\mu$s, representing a 30-fold improvement compared to that without decoupling pulses. Based on these results, a single NV$^0$ can reach the strong coupling regime when coupled with a high-impedance microwave resonator, thus opening up the possibility of microwave quantum electrodynamics using a single optically-active defect center in diamond.