Probing electronic decoherence with high-resolution attosecond photoelectron interferometry
David Busto
(1, 2)
,
Hugo Laurell
(1)
,
Daniel Finkelstein-Shapiro
(3, 4)
,
Christiana Alexandridi
(5, 6)
,
Marcus Isinger
(1)
,
Saikat Nandi
(1)
,
Richard J Squibb
(7)
,
Margherita Turconi
(5, 6)
,
Shiyang Zhong
(1)
,
Cord L Arnold
(1)
,
Raimund Feifel
(7)
,
Mathieu Gisselbrecht
(1)
,
Pascal Salières
(5, 6)
,
Tönu Pullerits
(1)
,
Fernando Martín
(8, 9, 10)
,
Luca Argenti
(11, 12)
,
Anne L’huillier
(1)
1
Lund University
2 Albert-Ludwigs-Universität Freiburg
3 Theoretical Chemistry, Lund University
4 UNAM - Universidad Nacional Autónoma de México = National Autonomous University of Mexico
5 LIDYL - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
6 ATTO - Attophysique
7 GU - Göteborgs Universitet = University of Gothenburg
8 UAM - Universidad Autónoma de Madrid
9 IMDEA-Nanociencia - Instituto Madrileño de Estudios Avanzados en Nanociencia
10 IFIMAC - Condensed Matter Physics Center
11 UCF - University of Central Florida [Orlando]
12 CREOL - Center for Research and Education in Optics and Lasers
2 Albert-Ludwigs-Universität Freiburg
3 Theoretical Chemistry, Lund University
4 UNAM - Universidad Nacional Autónoma de México = National Autonomous University of Mexico
5 LIDYL - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
6 ATTO - Attophysique
7 GU - Göteborgs Universitet = University of Gothenburg
8 UAM - Universidad Autónoma de Madrid
9 IMDEA-Nanociencia - Instituto Madrileño de Estudios Avanzados en Nanociencia
10 IFIMAC - Condensed Matter Physics Center
11 UCF - University of Central Florida [Orlando]
12 CREOL - Center for Research and Education in Optics and Lasers
Résumé
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 2p$^2 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