Shortcut to adiabatic isomeric population transfer of the 229 Th nucleus via hyperfine electronic bridge

Abstract The 229 Th nucleus is well known for its exceptionally low-lying nuclear isomeric level, which provides a unique platform for exploring electron–nucleus interactions and gives rise to a variety of rich physical phenomena. One such phenomenon is the hyperfine electronic bridge, which has recently been shown to enable efficient and precise manipulation of the nuclear isomeric levels of 229 Th [ Phys. Rev. Lett. 133 223001 (2024)]. However, that study used the stimulated Raman adiabatic passage method, which requires relatively long operation times. In this work, we employ the stimulated Raman shortcut-to-adiabatic passage method, which dramatically shortens the operation time from the order of hundreds of milliseconds to hundreds of microseconds while maintaining a transfer efficiency of about 79.38%.