Three-state model for interelectronic coherence and entanglement in helium in the time domain. Resonant driving between the 1⁢𝑠 and 2⁢𝑝0 states of He+ influences the time delay of the outgoing wave packet with energy ≈𝐸. Important final channels include the direct single ionization (DSI) leading to He+⁢(1⁢𝑠) and a free electron, and excitation-ionization (EI) to the He+ (2⁢𝑝0). Credit: Physical Review Letters (2024). DOI: 10.1103/PhysRevLett.133.163201 Quantum theory describes events that t...