Scholarlink

<p>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.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Measuring the quantum state of photoelectrons

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年1月29日

查看全文
  • Hugo Laurell,
  • Sizuo Luo,
  • Robin Weissenbilder,
  • Mattias Ammitzböll,
  • Shahnawaz Ahmed,
  • Hugo Söderberg,
  • C. Leon. M. Petersson,
  • Vénus Poulain,
  • Chen Guo,
  • Christoph Dittel,
  • Daniel Finkelstein-Shapiro,
  • Richard J. Squibb,
  • Raimund Feifel,
  • Mathieu Gisselbrecht,
  • Cord L. Arnold,
  • Andreas Buchleitner,
  • Eva Lindroth,
  • Anton Frisk Kockum,
  • Anne L’Huillier,
  • David Busto

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.