Nonlinear quantum spectroscopy with Parity-Time symmetric integrated circuits
Abstract
We propose a novel quantum nonlinear interferometer design that incorporates a passive PT symmetric coupler sandwiched between two nonlinear sections where signal-idler photon pairs are generated. The PT-symmetry enables efficient coupling of the longer-wavelength idler photons and facilitates the sensing of losses in the second waveguide exposed to analyte under investigation, whose absorption can be inferred by measuring only the signal intensity at a shorter wavelength where efficient detectors are readily available. Remarkably, we identify a new phenomenon of sharp signal intensity fringe shift at critical idler loss values, which is distinct from the previously studied PT-symmetry breaking. We discuss how such unconventional properties arising from quantum interference can provide a route to enhancing the sensing of analytes and facilitate broadband spectroscopy applications in integrated photonic platforms.
Keywords
Cite
@article{arxiv.2203.08703,
title = {Nonlinear quantum spectroscopy with Parity-Time symmetric integrated circuits},
author = {Pawan Kumar and Sina Saravi and Thomas Pertsch and Frank Setzpfandt and Andrey A. Sukhorukov},
journal= {arXiv preprint arXiv:2203.08703},
year = {2022}
}