论文标题
将零核自旋分子离子冷却至选定的旋转状态
Cooling of a Zero-Nuclear-Spin Molecular Ion to a Selected Rotational State
论文作者
论文摘要
我们证明了一氧化硅阳离子的旋转冷却，通过光滤器宽带激光器的光学泵送。与双原子氢化物相比，Sio \+由于其旋转间隔较小而对冷却更具挑战性。但是，Sio \+的旋转水平间距和较大的偶极矩可以通过微波直接操纵，并且其主要的同位素学中缺乏超细结构大大降低了对纯量子态制备的需求。这些功能使$^{28} $ si $^{16} $ o \+是诸如量子信息处理之类的未来应用程序的好候选者。对地面旋转状态的冷却是在100毫秒的时间范围内实现的，并达到94（3）\％的种群，同等温度$ t = 0.53（6）$K。我们还描述了一种新型的频谱过滤方法，将其冷却到任意旋转状态中，并使用它来证明狭窄的腐烂分布（$ n \ n \ n \ pm1 $）。
We demonstrate rotational cooling of the silicon monoxide cation via optical pumping by a spectrally filtered broadband laser. Compared with diatomic hydrides, SiO\+ is more challenging to cool because of its smaller rotational interval. However, the rotational level spacing and large dipole moment of SiO\+ allows direct manipulation by microwaves, and the absence of hyperfine structure in its dominant isotopologue greatly reduces demands for pure quantum state preparation. These features make $^{28}$Si$^{16}$O\+ a good candidate for future applications such as quantum information processing. Cooling to the ground rotational state is achieved on a 100 ms time scale and attains a population of 94(3)\%, with an equivalent temperature $T=0.53(6)$ K. We also describe a novel spectral-filtering approach to cool into arbitrary rotational states and use it to demonstrate a narrow rotational population distribution ($N\pm1$) around a selected state.
