Using light particles called qudits for high-capacity, secure quantum communication

https://phys.org/news/2024-07-scientists-method-high-capacity-quantum.html

"qudits encode information in higher dimensions, transmitting more data... chip allows precise manipulation enabling faster data transfer, increased resistance to errors... maintains quantum properties over long distances... 2-photon entangled state... signal photon manipulated on chip creating 4D qudit using spatial mode and polarization, idler photon remains unchanged as remote control for signal photon... manipulating idler controls signal photon encoding it with information... satellite-based quantum communication"

Related: New light source emits bright, entangled photons for quantum communication
https://phys.org/news/2024-08-source-emits-bright-entangled-photons.html