How to understand the tunneling in attosecond experiment?

Statistical approach to tunneling time in attosecond experiments

Attosecond science and the tunnelling time problem

A look under the tunnelling barrier via attosecond-gated interferometry

Attosecond real-time observation of electron tunnelling in atoms

Attosecond real-time observation of electron tunnelling and multi-electron dynamics in atoms

Attosecond double-slit experiment