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Area of Science:

  • Quantum Physics
  • Cavity Quantum Electrodynamics (CQED)

Background:

  • Single-atom cavity quantum electrodynamics (CQED) is crucial for quantum technologies.
  • Understanding light-matter interactions in the strong coupling regime is essential.

Purpose of the Study:

  • To investigate phase shifts in the strong coupling regime of single-atom CQED.
  • To explore the properties and controllability of these phase shifts.

Main Methods:

  • Observing phase shifts on light transmitted through a single-atom CQED system.
  • Analyzing the frequency and width dependence of the phase shift on system parameters.

Main Results:

  • A significant phase shift associated with an antiresonance was observed.
  • The phase shift's frequency and width were found to depend solely on the atom, not the cavity.
  • An optically controllable phase shift of 140°, the largest for a single emitter, was achieved.

Conclusions:

  • The observed phase shift is a robust phenomenon, controllable via optical means.
  • This provides a novel technique for characterizing complex integrated quantum circuits.