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arXiv · 2203.08703

Nonlinear quantum spectroscopy with Parity-Time symmetric integrated circuits

Pawan Kumar·Sina Saravi·Thomas Pertsch·Frank Setzpfandt·Andrey A. Sukhorukov
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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.

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Pawan Kumar, Sina Saravi, Thomas Pertsch, Frank Setzpfandt, Andrey A. Sukhorukov. 2022-03-16. Nonlinear quantum spectroscopy with Parity-Time symmetric integrated circuits. https://doi.org/10.1364/prj.450410

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