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Entanglement in photoionisation reveals the effect of ionic coupling in attosecond time delays

Author

Listed:
  • Ioannis Makos

    (University of Freiburg)

  • David Busto

    (University of Freiburg
    Lund University)

  • Jakub Benda

    (Charles University)

  • Dominik Ertel

    (University of Freiburg)

  • Barbara Merzuk

    (University of Freiburg)

  • Benjamin Steiner

    (University of Freiburg)

  • Fabio Frassetto

    (CNR)

  • Luca Poletto

    (CNR)

  • Claus Dieter Schröter

    (Max-Planck-Institut für Kernphysik)

  • Thomas Pfeifer

    (Max-Planck-Institut für Kernphysik)

  • Robert Moshammer

    (Max-Planck-Institut für Kernphysik)

  • Serguei Patchkovskii

    (Max Born Institute)

  • Zdeněk Mašín

    (Charles University)

  • Giuseppe Sansone

    (University of Freiburg
    University of Freiburg)

Abstract

Attosecond photoelectron interferometry, based on the measurement of photoelectron spectra generated by a two-colour field, provides access to the photoionisation dynamics of quantum systems. In general, due to the entanglement between the wave function of the emitted photoelectron and that of the parent ion, the dynamics driven by the infra-red field in the photoion can affect the properties of the photoemitted electronic wave packet, when the measurement protocol corresponds to the projection of the total time-dependent wave function onto a specific final state of the bipartite system. This is particularly relevant for molecules, due to their rich internal electronic and vibrational energy structure. Here we show how the polarisation of the ion influences the photoionisation dynamics by introducing an additional time delay in the photoelectrons emitted from CO2 molecules. The delay stems from the entanglement between the photoion and the photoelectron created in the photoionisation process.

Suggested Citation

  • Ioannis Makos & David Busto & Jakub Benda & Dominik Ertel & Barbara Merzuk & Benjamin Steiner & Fabio Frassetto & Luca Poletto & Claus Dieter Schröter & Thomas Pfeifer & Robert Moshammer & Serguei Pat, 2025. "Entanglement in photoionisation reveals the effect of ionic coupling in attosecond time delays," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-64182-8
    DOI: 10.1038/s41467-025-64182-8
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