Efficient photon-pair emission from a nanostructured resonator and its theoretical description

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Abstract
Spontaneous parametric down-conversion (SPDC) in subwavelength nanostructures is a promising source of quantum light, owing to its multifunctionality and ability to generate complex quantum states. Nevertheless, the mechanisms governing photon-pair generation in such systems remain only partially understood. In particular, experimental investigations of key emission properties in individual resonators, such as directionality and spectral distribution, are still lacking, and predictive theoretical frameworks have not yet been experimentally validated. Here, we report a measurement of the directional and spectral distributions of photon pairs generated via SPDC in a nanostructured resonator. Both distributions exhibit resonant behavior, which we describe using an extended quasi-normal-mode theory. This comparison is enabled by photon-pair count rates of up to 0.45 Hz/mW—to our knowledge, the highest reported for a nanostructured resonator. Our results provide a physical insight into nanoscale SPDC and represent an important step toward designing efficient miniaturized quantum light sources.
Funding Information
  • NATO SPS (G6026)
  • European Union (NQSTI—PE 00000023)
  • European Research Council—MultiFlaQS (101199215)

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