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Quantum-to-classical transition in cavity quantum electrodynamics.

J M Fink1, L Steffen, P Studer

  • 1Department of Physics, ETH Zürich, CH-8093, Zürich, Switzerland.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Investigating cavity quantum electrodynamics (QED) systems reveals how quantum oscillators transition to classical behavior as temperature increases. This study details the quantum-to-classical crossover and temperature extraction methods.

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Area of Science:

  • Quantum Optics
  • Cavity Quantum Electrodynamics (QED)
  • Quantum-Classical Transition

Background:

  • Cavity QED reveals quantum oscillator properties via coupling to two-level systems.
  • Low temperatures show quantum nature through vacuum Rabi oscillations and mode splittings.

Purpose of the Study:

  • To investigate the emergence of classical response from quantum cavity QED systems.
  • To explore the quantum-to-classical crossover as temperature is gradually increased.
  • To extract effective cavity field temperatures from measurements.

Main Methods:

  • Studying cavity QED systems with increasing thermal occupation over five orders of magnitude.
  • Performing spectroscopic and time-resolved vacuum Rabi measurements.
  • Analyzing the transition from quantum to classical behavior.

Main Results:

  • Demonstrated the continuous quantum-to-classical crossover in cavity QED systems.
  • Successfully extracted effective cavity field temperatures.
  • Observed how thermal occupation influences quantum properties.

Conclusions:

  • The classical response of cavity QED systems emerges gradually from their quantum behavior with increasing temperature.
  • Effective cavity field temperatures can be reliably extracted using spectroscopic and time-resolved methods.
  • Understanding this crossover is key for controlling quantum systems.