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Area of Science:

  • Quantum Optics and Condensed Matter Physics
  • Atomic, Molecular, and Optical Physics

Background:

  • The Dicke model describes interacting quantum systems, with potential for novel phenomena in biased variants.
  • Understanding critical properties and phase transitions is crucial for characterizing quantum systems.

Purpose of the Study:

  • To investigate the critical properties of the biased Dicke model in the classical oscillator limit.
  • To analyze the impact of finite bias on excitation energy, squeezing, and entanglement.

Main Methods:

  • Analytical calculations were performed for the biased Dicke model in the classical oscillator limit.
  • Focus on the finite-biased case to examine critical behavior.

Main Results:

  • Excitation energy does not vanish for arbitrary coupling in the finite-biased case, avoiding a second-order phase transition.
  • This contrasts with the behavior observed in the original Dicke model.
  • Finite bias significantly modifies ground-state squeezing and entanglement near the critical coupling point.

Conclusions:

  • The biased Dicke model exhibits distinct critical properties compared to the standard Dicke model.
  • Bias introduces significant changes in quantum correlations (squeezing and entanglement) near criticality.