Non-Hermitian engineering for brighter broadband pseudothermal light

Nicolás Quesada, Perimeter Institute for Theoretical Physics
Eugene Adjei, Perimeter Institute for Theoretical Physics
Ramy El-Ganainy, Michigan Technological University
Agata M. Brańczyk, Perimeter Institute for Theoretical Physics

© 2019 American Physical Society. Publisher’s version of record:


We show that non-Hermitian engineering can play a positive role in quantum systems. This is in contrast to the widely accepted notion that optical losses are a drawback that must be eliminated or, at least, minimized. We take advantage of the interplay between nonlinear interactions and loss to show that spectral-loss engineering can relax phase-matching conditions, enabling generation of broadband pseudothermal states at new frequencies. This opens the door for utilizing the full potential of semiconductor materials that exhibit giant nonlinearities but lack the necessary ingredients for achieving quasi-phase-matching. This in turn may pave the way for building on-chip quantum light sources.