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Updated: Jan 4, 2026

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Researchers observed ultrafast electron dynamics in a silicon single-electron source. This breakthrough enables time-resolved detection of quantum coherent oscillations at 250 GHz, advancing quantum technology applications.

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Area of Science:

  • Quantum technology
  • Condensed matter physics
  • Ultrafast phenomena

Background:

  • Understanding ultrafast coherent electron dynamics is crucial for quantum technologies like single-electron sources and qubit control.
  • Current experimental bandwidths limit the observation of internal dynamics in submicrometre devices.
  • Existing detection methods lack time-resolved capabilities for these fast dynamics.

Purpose of the Study:

  • To theoretically and experimentally demonstrate a method for observing internal dynamics in submicrometre devices.
  • To achieve time-resolved detection of electron motion within a silicon single-electron source.
  • To investigate quantum coherent oscillations at high frequencies.

Main Methods:

  • Utilized a silicon single-electron source with a dynamic quantum dot.
  • Employed a resonant level as a detector for time-resolved measurements.
  • Performed theoretical simulations with realistic parameters alongside experimental validation.
  • Achieved picosecond resolution in detecting electron dynamics.

Main Results:

  • Successfully observed internal dynamics in the silicon single-electron source.
  • Demonstrated quantum coherent spatial oscillations of an electron wave packet at approximately 250 GHz.
  • Validated experimental findings through simulations, confirming the 250 GHz oscillation frequency.
  • Operated the experiment at 4.2 K.

Conclusions:

  • The developed technique allows for effective time-resolved observation of internal dynamics in submicrometre devices.
  • This method overcomes the limitations of current experimental bandwidths for studying ultrafast electron motion.
  • Future applications include detecting fast dynamics in cavities, controlling non-adiabatic excitations, and engineering single-electron sources for advanced quantum technologies.