Non-Hermitian engineering for brighter broadband pseudothermal light

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Department of Electrical and Computer Engineering


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.

Publication Title

Physical Review A