Time-Periodic Driving of a Bath-Coupled Open Quantum Gas of Light
Phys. Rev. Lett. 135, 033603 – Published 17 July, 2025
DOI: https://doi.org/10.1103/922g-1fng
Abstract
We study the frequency-resolved density response of a photon Bose–Einstein condensate coupled to a bath of dye molecules by time-periodic driving. By monitoring the photon number dynamics for different drive frequencies, we obtain the spectral response of the condensate in a phase-sensitive way. We find that as the photon number increases, the response of the coupled condensate-bath system transitions from overdamped to resonant behavior, indicating a transition from closed to open system dynamics. Our spectroscopy method paves the way for studies of collective excitations in complex driven-dissipative systems.
