朗道–齐纳跃迁过程中Rabi振荡的不同实现方法
Realizing Rabi oscillations between Landau-Zener transitions with different methods

多重朗道–齐纳跃迁过程的干涉会形成周期的拉比(Rabi)振荡, 但是由于普通量子系统的相干时间不足以 产生长序列朗道–齐纳过程的相干干涉, 所以这种Rabi 振荡也很少能够实验观测到. 本文利用金刚石中的氮空位 (nitrogen-vacancy, NV)色心量子系统, 通过施加三角波、正弦波、方波3种不同形式的电场进行仿真试验后, 最终都 可以观察到周期的Rabi振荡. 从而验证了NV色心系统良好的量子可控性, 可用于量子计量学及量子信息处理. 另外 在施加不同形式的外加场观察Rabi振荡的过程中也发现, 在非绝热表象与绝热表象下Rabi振荡会有不同的表现, 适 当的选择表象也有助于作者观察Rabi振荡.
It is known that interference between multiple Laudau-Zerner (LZ) transitions can produce periodic Rabi oscillations. One of the main requirements for the observation of such Rabi oscillations is that the coherence time of the quantum system must be long enough to allow the coherent interference between a long sequence of LZ processes. Rabi oscillations can all be observed by simulations with triangle, sine and square control fields applied in a nitrogen-vacancy (NV) Center spin in isotopically purified diamond. The results demonstrate its good quantum controllability, and thus NV centers can have potential applications in quantum metrology and quantum information processing. It is found that the Rabi oscillations are different in the diabatic and adiabatic bases with the above three kinds of control fields. Proper basis is useful to study the Rabi oscillations.