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We show that two-polariton blockade (2PB) occurs in ultrastrong coupling (USC) atom-cavity systems. This novel phenomenon, distinct from other coupling regimes, enables new quantum light sources.

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Area of Science:

  • Quantum optics
  • Cavity quantum electrodynamics
  • Solid-state physics

Background:

  • Ultrastrong coupling (USC) regime involves significant light-matter interaction, leading to polariton formation.
  • Traditional strong and weak coupling regimes do not exhibit the discussed phenomenon.
  • Polaritons are hybrid light-matter quasiparticles crucial for quantum technologies.

Purpose of the Study:

  • To demonstrate two-polariton blockade (2PB) in the USC regime.
  • To differentiate 2PB from phenomena in other coupling regimes.
  • To explore implications for quantum light sources.

Main Methods:

  • Utilizing an atom-cavity system operating in the USC regime.
  • Applying resonant single-polariton driving.
  • Employing modified second- and third-order correlation functions tailored for USC.

Main Results:

  • Observed 2PB, a distinct quantum effect.
  • Characterized 2PB by pronounced two-polariton bunching.
  • Noted suppressed three-polariton coincidences.

Conclusions:

  • 2PB is achievable and unique to the USC regime.
  • This work presents a novel pathway to 2PB.
  • The findings hold promise for developing multiparticle quantum light sources.