A single coupled-photonic-resonator platform in which the coherent versus dissipative nature of photon-photon coupling - set by constructive/destructive interference of the resonator fields with a shared transmission line - can be tuned to switch between two distinct wave phenomena. In the dissipative regime, destructive interference of two lossy modes near their frequency crossing produces a Friedrich-Wintgen bound state in the continuum (a non-radiating confined mode embedded in a radiative continuum), appearing as an absorption feature. Rotating one resonator and adjusting the coupling parameter instead yields coupling-induced transparency. The controllable BIC-to-transparency transition enables programmable oscillators, filters, sensors, and quantum information devices.
A quantum-photonics study of two hybrid photonic resonators coupled through a common microwave transmission line, where constructive/destructive interference of the resonator fields with the line's r…