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We demonstrate the dynamical Casimir effect in polaritonic materials at room temperature. This quantum effect generates nonclassical thermal states, even at high temperatures, opening new avenues for nanoscale applications.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Nanophotonics

Background:

  • The dynamical Casimir effect (DCE) typically requires cryogenic temperatures.
  • Near-field interactions significantly influence quantum phenomena.

Purpose of the Study:

  • To investigate the DCE in time-modulated polaritonic systems at finite temperatures.
  • To explore the generation of nonclassical thermal states via DCE.

Main Methods:

  • Developed a rigorous fluctuational electrodynamics formalism.
  • Analyzed degenerate and nondegenerate two-polariton emission processes.
  • Conducted nonclassicality tests on radiative flux.

Main Results:

  • Identified contributions from both quantum and thermal fluctuations.
  • Observed a dominant quantum contribution even at room temperature due to strong near-field effects.
  • Achieved nonclassical photon states up to ~250 K.

Conclusions:

  • The DCE can be explored beyond cryogenic temperatures.
  • Tunable nanoscale nonclassical thermal states can be created.
  • Higher-order DCE allows flux generation with lower modulation frequencies.