Probing electronic decoherence with high-resolution attosecond photoelectron interferometry

David Busto, Hugo Laurell, Daniel Finkelstein-Shapiro, Christiana Alexandridi, Marcus Isinger, Saikat Nandi, Richard J. Squibb, Margherita Turconi, Shiyang Zhong, Cord L. Arnold, Raimund Feifel, Mathieu Gisselbrecht, Pascal Salières, Tönu Pullerits, Fernando Martín, Luca Argenti, Anne L’Huillier

Research output: Contribution to journalArticlepeer-review


Abstract: Quantum coherence plays a fundamental role in the study and control of ultrafast dynamics in matter. In the case of photoionization, entanglement of the photoelectron with the ion is a well-known source of decoherence when only one of the particles is measured. Here, we investigate decoherence due to entanglement of the radial and angular degrees of freedom of the photoelectron. We study two-photon ionization via the 2s2p autoionizing state in He using high spectral resolution photoelectron interferometry. Combining experiment and theory, we show that the strong dipole coupling of the 2s2p and 2p2 states results in the entanglement of the angular and radial degrees of freedom. This translates, in angle-integrated measurements, into a dynamic loss of coherence during autoionization. Graphic Abstract: [Figure not available: see fulltext.].

Original languageEnglish
Article number112
JournalEuropean Physical Journal D
Issue number7
Publication statusPublished - 2022 Jul

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics


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