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

Makos, Ioannis ; Busto, David LU orcid ; Benda, Jakub ; Ertel, Dominik ; Merzuk, Barbara ; Steiner, Benjamin ; Frassetto, Fabio ; Poletto, Luca ; Schröter, Claus Dieter and Pfeifer, Thomas , et al. (2025) In Nature Communications 16(1).
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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
16
issue
1
article number
8554
publisher
Nature Publishing Group
external identifiers
  • pmid:41022806
  • scopus:105017519804
ISSN
2041-1723
DOI
10.1038/s41467-025-64182-8
language
English
LU publication?
yes
additional info
Publisher Copyright: © The Author(s) 2025.
id
5bc48af4-e015-4cc4-a779-725792c451fe
date added to LUP
2025-11-19 23:12:13
date last changed
2025-11-20 09:47:42
@article{5bc48af4-e015-4cc4-a779-725792c451fe,
  abstract     = {{<p>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 CO<sub>2</sub> molecules. The delay stems from the entanglement between the photoion and the photoelectron created in the photoionisation process.</p>}},
  author       = {{Makos, Ioannis and Busto, David and Benda, Jakub and Ertel, Dominik and Merzuk, Barbara and Steiner, Benjamin and Frassetto, Fabio and Poletto, Luca and Schröter, Claus Dieter and Pfeifer, Thomas and Moshammer, Robert and Patchkovskii, Serguei and Mašín, Zdeněk and Sansone, Giuseppe}},
  issn         = {{2041-1723}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Communications}},
  title        = {{Entanglement in photoionisation reveals the effect of ionic coupling in attosecond time delays}},
  url          = {{http://dx.doi.org/10.1038/s41467-025-64182-8}},
  doi          = {{10.1038/s41467-025-64182-8}},
  volume       = {{16}},
  year         = {{2025}},
}