Impact of photon entanglement on reconstructed photoelectron density matrices

Ascertain how photon entanglement influences the reconstructed photoelectron density matrix in strong-field processes, and determine whether experimental measurements can unambiguously reveal underlying quantum correlations from such reconstructions.

Background

Recent advances have enabled reconstruction of the photoelectron density matrix in strong-field experiments, providing a new testbed for quantum optical aspects of attoscience. Studies so far have clarified how classical and quantum noise affect purity in the reconstructed states.

However, the role of photon entanglement between light and matter in shaping the reconstructed photoelectron density matrix remains unresolved. Establishing whether experimental data can unambiguously certify underlying quantum correlations is essential for connecting QED of attoscience with broader frameworks of multi-fragment decay (Zerfall) processes and for validating quantum information approaches in ultrafast regimes.