Particle Production in Ultra-Strong Coupling Waveguide QED

Understand

Understanding large-scale interacting quantum matter requires dealing with the huge number of quanta that are produced by scattering even a few particles against a complex quantum object.

• Prominent examples are found from high energy cosmic ray showers to the optical or electrical driving of degenerate Fermi gases.
• We tackle this challenge in the context of many-body quantum optics, as motivated by the recent developments of circuit quantum electrodynamics at ultrastrong coupling.
• The issue of particle production is addressed quantitatively with a simple yet powerful concept rooted in the quantum superposition principle.