Dynamic control of atomic dressing to the highly-excited Rydberg state in multi-level systems has special appeals owing to the development of flexible and precise measurement. In this study we develop an experimentally-accessible proposal to robustly control the dressing probability via a three-step cascaded excitation with double electromagnetically induced transparency (EIT) technique. The system can function as an optical switch where the third addressing laser serving as the control knob can switchably engineer the dressing probability with time. Differing from a conventional two-photon EIT, this novel scheme facilitates the maximal dressing probability determined by a relative strength between two coupling fields, entirely relaxing the absolute values for strong lasers. The collective feature caused by the interactions of a few atoms is also studied leading to an enhanced dressing probability as well as a reduced response time. Our work offers the opportunity to a coherent dynamic control of Rydberg excitation and to realize sizable Rydberg-Rydberg interactions in weakly-driven quantum systems.
Interplay between electromagnetically induced transparency(EIT), absorption (EIA) and Autler-Townes (AT) splitting in N-type atomic system: An experiment and theory
Velocity-selective EIT measurement of potassium Rydberg states
我们展示了一个速度选择方案，减轻抑制电磁感应透明（EIT）的多普勒频移低-高EIT探头-耦合波长排序。与EIT探测光束反向传播的光泵浦光以速度选择的方式在超精细态之间转移原子。与光学泵浦光束的斩波同步的透射探测光束的测量使得能够检测无多普勒EIT信号。在加热的蒸气室中，通过EIT光谱法获得$^{39}$ K中$n=$ 26、27和28的5 P $_{1/2}$和$n$ S $_{1/2}$态之间的跃迁频率，其中探测光束稳定于4S $_{1/2}\rightarrow$ 5 P $_{1/2}$跃迁。利用以前对4S $_{1/2}\rightarrow$ nS $_{1/2}$跃迁的高分辨率测量，我们确定了4S $_{1/2}\rightarrow$ 5 P $_{1/2}$跃迁的绝对频率。我们的测量从目前接受的值偏移了560 MHz，不确定性提高了两倍。这些测量结果将使由$^{40}$ K原子组成的里德堡修饰超冷费米气体的新实验成为可能。
Femtosecond induced transparency and absorption in the extreme ultraviolet by coherent coupling of the He 2s2p (1P0) and 2p2 (1Se) double excitation states with 800 nm light
Floquet Interpretation of Avoided Crossings in AC Stark-Shifted Rydberg-EIT Spectra
National Institute of Standards and Technology（美国国家标准与技术研究院）；Department of Electrical, Computer, and Engineering, University of Colorado, Boulder（科罗拉多大学博尔德分校电气、计算机与工程学院）
Angle-of-Arrival Determination of Radio-Frequency Fields Using Stark-Shifted Rydberg-EIT Spectra
National Institute of Standards and Technology（美国国家标准与技术研究院）；Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder（科罗拉多大学博尔德分校电气、计算机与能源工程系）
Giant third-order polarization rotation via wave-mixing-induced symmetry breaking in a Rydberg-EIT medium
School of Physics, East China Normal University（华东师范大学物理系）；School of Physical Science and Technology, Soochow University（苏州大学物理科学与技术学院）；Division of Precision Measurement Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences（中国科学院精密测量科学与技术创新研究院精密测量物理研究室）
