A new time-frequency method to reveal quantum dynamics of atomic hydrogen in intense laser pulses: Synchrosqueezing Transform
For researchers in quantum optics and attosecond physics, this provides a new tool for analyzing quantum dynamics, though it is an incremental application of an existing method to a new domain.
This paper introduces synchrosqueezing transform (SST) as a new adaptive time-frequency analysis technique for revealing quantum dynamics of atomic hydrogen in intense laser pulses. SST clearly depicts intrinsic quantum dynamical processes such as selection rules, AC Stark effects, and high harmonic generation, outperforming classical TF methods.
This study introduces a new adaptive time-frequency (TF) analysis technique, synchrosqueezing transform (SST), to explore the dynamics of a laser-driven hydrogen atom at an {\it ab initio} level, upon which we have demonstrated its versatility as a new viable venue for further exploring quantum dynamics. For a signal composed of oscillatory components which can be characterized by instantaneous frequency, the SST enables rendering the decomposed signal based on the phase information inherited in the linear TF representation with mathematical support. Compared with the classical type TF methods, the SST clearly depicts several intrinsic quantum dynamical processes such as selection rules, AC Stark effects, and high harmonic generation.