Driving Alkali Rydberg Transitions with a Phase-Modulated Optical Lattice

Rydberg electromagnetically induced transparency in 40K ultracold Fermi gases

“…The second method is the unusual EIT spectrum, which is carried out by measuring the probe beam intensity by scanning the frequency of the coupling beam across the atomic transition and keeping the probe laser locked to resonance [40] , which can eliminate the Doppler background in thermal vapors [41] ; the probe-absorption signal shows transparency peak whenever the coupling laser comes into resonance. The unusual EIT spectrum presents a dark background [42] , which seems to be of great benefit for applications such as the measurement with high resolution of hyperfine splitting between excited states [43,44] , laser-frequency stabilization [45,46] , and the study of highly excited Rydberg states [47][48][49] .…”

On-Chip Topological Photonic Crystal Nanobeam Filters

“…However, the realization of topological nanophotonic crystal devices remains challenging, primarily due to material constraints and the complexity of their design. Recent advancements in the field have introduced the concept of synthetic dimensions, which allows for the exploration of topological physics in higher-dimensional spaces beyond the traditional geometrical dimensionality of the structures. − This innovative approach simplifies the design of on-chip TPC devices by eliminating the reliance on specific symmetry protection or stringent material requirements. − By incorporating synthetic dimensions, researchers have opened up new possibilities for realizing practical topological nanophotonic crystal devices.…”