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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Cavity quantum electrodynamics

Background:

  • Light-matter interactions are fundamental for controlling quantum materials.
  • Optical cavities enable manipulation of quantum systems.

Purpose of the Study:

  • Investigate cavity effects on a quantum chain of interacting spinless fermions.
  • Understand the role of quantum fluctuations in light-matter entanglement.
  • Explore how light-matter entanglement modifies electronic properties.

Main Methods:

  • Numerically exact solutions.
  • Perturbative analytical expansions.

Main Results:

  • Quantum fluctuations of the matter system are essential for light-matter entanglement.
  • Light-matter entanglement is key to cavity-induced modification of electronic properties.
  • Hypothesized that coupling-dependent quantum fluctuations are prerequisites for ground-state entanglement.

Conclusions:

  • Quantum fluctuations and light-matter entanglement are pivotal for cavity control of quantum materials.
  • Findings have implications for light-matter-entangled phases and cavity-modified phase transitions.
  • Suggests methods for measuring light-matter entanglement via Kubo response functions.