Measuring the quantum state of photoelectrons

被引：0

作者：

Laurell, Hugo ^{[1
]}

Luo, Sizuo ^{[1
]}

Weissenbilder, Robin ^{[1
]}

Ammitzboell, Mattias ^{[1
]}

Ahmed, Shahnawaz ^{[2
]}

Soederberg, Hugo ^{[1
]}

Petersson, C. Leon. M. ^{[3
]}

Poulain, Venus ^{[1
]}

Guo, Chen ^{[1
]}

Dittel, Christoph ^{[4
,5
,6
]}

Finkelstein-Shapiro, Daniel ^{[7
]}

Squibb, Richard J. ^{[8
]}

Feifel, Raimund ^{[8
]}

Gisselbrecht, Mathieu ^{[1
]}

Arnold, Cord L. ^{[1
]}

Buchleitner, Andreas ^{[4
,5
]}

Lindroth, Eva ^{[3
]}

Frisk Kockum, Anton ^{[2
]}

L'Huillier, Anne ^{[1
]}

Busto, David ^{[1
]}

机构：

[1] Lund Univ, Dept Phys, Lund, Sweden

[2] Chalmers Univ Technol, Dept Microtechnol & Nanosci, Gothenburg, Sweden

[3] Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, Stockholm, Sweden

[4] Albert Ludwigs Univ Freiburg, Phys Inst, Freiburg, Germany

[5] Albert Ludwigs Univ Freiburg, EUCOR Ctr Quantum Sci & Quantum Comp, Freiburg, Germany

[6] Albert Ludwigs Univ Freiburg, Freiburg Inst Adv Studies, Freiburg, Germany

[7] Univ Nacl Autonoma Mexico, Inst Quim, Mexico City, Mexico

[8] Univ Gothenburg, Dept Phys, Gothenburg, Sweden

来源：

NATURE PHOTONICS | 2025年

基金：

瑞典研究理事会; 欧洲研究理事会;

关键词：

ATTOSECOND; SPECTROSCOPY; PHOTOIONIZATION; RECONSTRUCTION; ENTANGLEMENT; DELAYS; TIME;

D O I：

10.1038/s41566-024-01607-8

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页码：352 / 357

页数：14