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Roadmap for Quantum Nanophotonics with Free Electrons.

F Javier García de Abajo1,2, Albert Polman3, Cruz I Velasco1

  • 1ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain.

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Advancements in electron microscopy allow free-electron beams to probe materials at the nanoscale with high spatial and temporal resolution. These beams are becoming vital tools for quantum nanophotonics, enabling new discoveries in quantum phenomena.

Keywords:
electron microscopyelectron−light interactionsmaterials sciencequantum physicsultrafast phenomena

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Area of Science:

  • Physics
  • Materials Science
  • Quantum Optics

Background:

  • Electron microscopy has evolved significantly, enabling precise control and characterization of free-electron beams.
  • These beams possess evanescent electromagnetic fields for localized excitation and high-resolution material analysis (sub-Å, few-meV).
  • Ultrafast electron microscopy integrates pulsed light for sub-femtosecond temporal resolution and enhanced electron wave function control.

Purpose of the Study:

  • To outline the current state of free-electron beams in advanced microscopy and quantum nanophotonics.
  • To identify key challenges and opportunities in the field.
  • To discuss future research directions through expert contributions.

Main Methods:

  • Leveraging high-quality free-electron beams for material characterization.
  • Utilizing ultrafast electron microscopy for time-resolved studies.
  • Exploring the quantum information capabilities of free electrons.

Main Results:

  • Free electrons provide sub-Ångström spatial and few-meV energy resolution.
  • Ultrafast electron microscopy achieves sub-femtosecond temporal resolution.
  • Free electrons demonstrate potential for quantum information transfer and entanglement.

Conclusions:

  • Free electrons are powerful tools in quantum nanophotonics, comparable to photons.
  • They enable the study of nanoscale quantum phenomena and entanglement.
  • This field is rapidly evolving with significant future potential.