We demonstrate coherent microwave control of rotational and hyperfine states of trapped, ultracold, and chemically stable [superscript 23]Na [superscript 40]K molecules. Starting with all molecules in the absolute rovibrational and hyperfine ground state, we study rotational transitions in combined magnetic and electric fields and explain the rich hyperfine structure. Following the transfer of the entire molecular ensemble into a single hyperfine level of the first rotationally excited state, J=1, we observe lifetimes of more than 3 s, comparable to those in the rovibrational ground state, J=0. Long-lived ensembles and full quantum state control are prerequisites for the use of ultracold molecules in quantum simulation, precision measurements, and quantum information processing.
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机译：我们展示了相干的微波控制的旋转和捕获，超冷和化学稳定的[上标23] Na [上标40] K分子的超精细状态。从处于绝对旋转振动和超精细基态的所有分子开始，我们研究磁场和电场的组合中的旋转跃迁，并解释了丰富的超精细结构。将整个分子集合转移到第一个旋转激发态J = 1的单个超精细水平之后，我们观察到寿命超过3s，与处于振动基态J = 0的寿命相当。长寿命的合奏和完整的量子态控制是在量子模拟，精度测量和量子信息处理中使用超冷分子的先决条件。
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