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Sökning: WFRF:(Ammitzböll M.)

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1.
  • Laurell, H., et al. (författare)
  • Continuous-variable quantum state tomography of photoelectrons
  • 2022
  • Ingår i: Physical Review Research. - 2643-1564. ; 4:3
  • Tidskriftsartikel (refereegranskat)abstract
    • We propose a continuous variable quantum state tomography protocol of electrons which result from the ionization of atoms or molecules by the absorption of extreme ultraviolet light pulses. Our protocol is benchmarked against a direct calculation of the quantum state of photoelectrons ejected from helium and argon in the vicinity of a Fano resonance. In the latter case, we furthermore distill ion-photoelectron entanglement due to spin-orbit splitting. This opens routes toward the investigation of quantum coherence and entanglement properties on the ultrafast timescale.
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3.
  • Neoričić, L., et al. (författare)
  • Resonant two-photon ionization of helium atoms studied by attosecond interferometry
  • 2022
  • Ingår i: Frontiers in Physics. - : Frontiers Media SA. - 2296-424X. ; 10
  • Tidskriftsartikel (refereegranskat)abstract
    • We study resonant two-photon ionization of helium atoms via the 1s3p, 1s4p and 1s5p P-1(1) states using the 15(th) harmonic of a titanium-sapphire laser for the excitation and a weak fraction of the laser field for the ionization. The phase of the photoelectron wavepackets is measured by an attosecond interferometric technique, using the 17(th) harmonic. We perform experiments with angular resolution using a velocity map imaging spectrometer and with high energy resolution using a magnetic bottle electron spectrometer. Our results are compared to calculations using the two-photon random phase approximation with exchange to account for electron correlation effects. We give an interpretation for the multiple pi-rad phase jumps observed, both at and away from resonance, as well as their dependence on the emission angle.
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4.
  • Laurell, Hugo, et al. (författare)
  • Measuring the quantum state of photoelectrons
  • 2023
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • A photoelectron, emitted due to the absorption of light quanta as described by the photoelectric effect, is often characterized experimentally by a classical quantity, its momentum. However, since the photoelectron is a quantum object, its rigorous characterization requires the reconstruction of the complete quantum state, the photoelectron's density matrix. Here, we use quantum state tomography to fully characterize photoelectrons emitted from helium and argon atoms upon absorption of ultrashort, extreme ultraviolet light pulses. While in helium we measure a pure photoelectronic state, in argon, spin-orbit interaction induces entanglement between the ion and the photoelectron, leading to a reduced purity of the photoelectron state. Our work shows how state tomography gives new insights into the fundamental quantum aspects of light-induced electronic processes in matter, bridging the fields of photoelectron spectroscopy and quantum information, and offering new spectroscopic possibilities for quantum technology.
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  • Resultat 1-4 av 4

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