In collaboration with Elisabeth Wagner, Polina Sharapova from the University of Paderborn, and Mike Steel from MQ, we’ve published a theoretical proposal on using waveguides with helical gratings to generate pairs of polarisation-entangled photons, in New Journal of Physics:
Elisabeth Wagner, Mikołaj K Schmidt, Michael J Steel and Polina R Sharapova, “Generation of polarization-entangled counter-propagating photons with high orbital angular momentum,” New Journal of Physics, 27 064106 (2025)
ArXiv version is available at https://arxiv.org/abs/2410.12113.
Mikołaj K. Schmidt 