High-performance quantum coherent receiver fabricated within borosilicate glass using fs laser writing advances quantum communication

https://www.eurekalert.org/news-releases/1115841

"silicon: high optical loss/ polarization sensitivity degrade quantum signals... overcome using more stable/ efficient borosilicate glass photonic chip... low 1 dB loss, handles all light orientations, laser writing for more compact/ reduced scattering 3D waveguide routing, highly resistant to thermal/ mechanical fluctuations over 8+ hours, integrates beam splitters/ phase shifters/ directional couplers... record 42.7 Gbit/s secure rate for an RNG, generated secret keys at 3.2 Mbit/s over simulated 9.3-km fiber link"