"Attosecond pulses produced by high-harmonic generation can ionize any conceivable compound, leading to the formation of a bipartite ion-photoelectron system that is entangled whenever the total wavefunction cannot be written as a single direct product."
"Ultrashort pulses excite coherent superpositions of states, creating a path towards observation of their time-resolved dynamics, which is taken to the extreme in attosecond science."
"Coherent dynamics in the ion or photoelectron subsystem is only possible if it is not compromised by quantum entanglement, similar to a multi-slit interference experiment."
Attosecond pulses generated by high-harmonic generation can ionize compounds, forming entangled ion-photoelectron systems. This entanglement occurs when the total wavefunction cannot be expressed as a direct product. Ionization experiments with narrowband light sources lead to different ion eigenstates and corresponding photoelectron kinetic energies. Attosecond science allows for coherent excitation of multiple electronic configurations, initiating correlated dynamics. Coherent dynamics in subsystems require that quantum path information is not compromised, similar to multi-slit interference experiments where observation affects interference patterns.
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