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Area of Science:

  • Quantum electronics
  • Condensed matter physics
  • Nanoscale science

Background:

  • Quantum Hall effect enables robust electron transport in edge channels.
  • Controlling single electrons is crucial for quantum computing and electronics.

Purpose of the Study:

  • To demonstrate time- and energy-resolved detection of single-electron wave packets.
  • To investigate electron transport properties in quantum Hall edge channels.
  • To show the capability of switching individual electrons between edge channels.

Main Methods:

  • Utilizing a clock-controlled quantum dot source to emit single electrons.
  • Employing energy spectroscopy to analyze electron properties.
  • Applying time-resolved spectroscopy for picosecond resolution wave packet analysis.

Main Results:

  • Single-electron wave packets were detected with energy and time resolution.
  • Electrons were transported over several microns without inelastic scattering at high magnetic fields.
  • The wave packet size was determined at picosecond resolution.
  • Individual electrons were successfully switched into different edge channels.

Conclusions:

  • High-energy quantum Hall edge channels support ballistic transport of single-electron wave packets.
  • Time-resolved spectroscopy is a powerful tool for characterizing electron wave packets.
  • This technique offers precise control over individual electrons for quantum applications.