Ji Zhonghua, Gong Ting, He Yonglin, Hutson Jeremy M, Zhao Yanting, Xiao Liantuan, Jia Suotang
Shanxi University, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Wucheng Rd. 92, 030006 Taiyuan, China.
Phys Chem Chem Phys. 2020 Jun 21;22(23):13002-13007. doi: 10.1039/d0cp01191f. Epub 2020 Jun 1.
We report the observation of microwave coherent control of rotational states of ultracold RbCs molecules formed in their vibronic ground state by short-range photoassociation. Molecules are formed in the single rotational state X(v = 0, J = 1) by exciting pairs of atoms to the short-range state (2)Π(v = 11, J = 0), followed by spontaneous decay. We use depletion spectroscopy to record the dynamic evolution of the population distribution and observe clear Rabi oscillations while irradiating on a microwave transition between coupled neighbouring rotational levels. A density-matrix formalism that accounts for longitudinal and transverse decay times reproduces both the dynamic evolution during the coherent process and the equilibrium population. The coherent control reported here is valuable both for investigating coherent quantum effects and for applications of cold polar molecules produced by continuous short-range photoassociation.
我们报告了通过短程光缔合在其振转基态形成的超冷RbCs分子转动态的微波相干控制的观测结果。通过将原子对激发到短程态(2)Π(v = 11, J = 0)，随后自发衰变，分子在单一转动态X(v = 0, J = 1)中形成。我们使用耗尽光谱法记录布居分布的动态演化，并在耦合的相邻转动能级之间的微波跃迁上进行辐照时观察到清晰的拉比振荡。考虑纵向和横向衰变时间的密度矩阵形式既再现了相干过程中的动态演化，也再现了平衡布居。这里报道的相干控制对于研究相干量子效应以及对于通过连续短程光缔合产生的冷极性分子的应用都很有价值。
