Quantum photonics has the potential of revolutionizing technology by bringing quantum effects toward applications. Among the most prominent effects resulting from nonlinear light–matter interaction is the generation of correlated and entangled photons through various processes (spontaneous parametric down-conversion, spontaneous four-wave mixing). Such nonlinear optical processes benefit from the concentration of electromagnetic fields in small volumes.
Dielectric nanoresonators and their 2D layouts—metasurfaces—provide efficient ways to control light in subwavelength volumes enabling the enhancement of nonlinear light–matter interaction and the generation of entangled photons. Nanoresonators and metasurfaces offer a radical miniaturization of quantum light sources allowing better scalability, which opens a pathway toward arrangements of photon sources in complex subwavelength configurations for advanced photon state control. In this review, we highlight the recent progress in this emergent area of research.
Read more here: https://doi.org/10.1002/lpor.202200408
Nonlinear dielectric nanoresonators and metasurfaces: towards efficient generation of entangled photons, P. R. Sharapova, S. S. Kruk, A. S. Solntsev, Laser and Photonics Reviews 2200408 (2023)