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A: Fachverband Atomphysik

A 21: Ultrafast Dynamics II (joint session MO/A)

A 21.3: Vortrag

Donnerstag, 9. März 2023, 11:30–11:45, F102

Control of ion+photoelectron entanglement in an attosecond pump-probe experiment — •Lisa-Marie Koll, Tobias Witting, and Marc JJ Vrakking — Max Born Institute, Berlin, Germany

Quantum mechanical entanglement is a vibrant topic, culminating in this year's Nobel price award. In attosecond science, it is common to use radiation in the extreme ultra-violet (XUV) regime to study atomic and electronic dynamics. Due to their high photon energy any sample (solid, liquid or gaseous) placed in their path is ionized, creating a bipartite quantum system, i.e. an ion+photoelectron. Entanglement between those sub-systems can have measurable consequences for any attosecond experiment [1]. To illustrate the role of entanglement in photoionization we designed an experimental protocol, which utilizes a pair of phase-locked XUV pulses [2] and an IR pulse to ionize hydrogen molecules. The initially entangled ion+photoelectron system created by the XUV photoionization process is converted by the IR pulse into a coherent superposition of the gerade and ungerade electronic state of the ionic molecule leading to the observation of electronic localization [3]. By changing the time delay between the two XUV pulses the degree of ion+photoelectron entanglement is controlled and as a consequence the degree of electronic coherence. This can lead to the suppression of the observable electronic localization for certain time delays.

[1] L.-M. Koll et. al., Physical Review Letters 128, 043201 (2022)

[2] L.-M. Koll et al., Optics Express 30, 7082-7095 (2022)

[3] G. Sansone et al., Nature 465, 763-766 (2010)