Three degree of freedom hybrid entanglement-carrying orbital angular momentum enhances quantum communication capacity/ precision

https://www.eurekalert.org/news-releases/1073753

"prepare hybrid polarization-cat entangled state, then introduce orbital angular momentum (OAM) degree of freedom by inserting q-plate in e cat-encoded CV part, converting Gaussian beam to OAM beam... prepared hybrid entangled states have non-0 logarithmic negativities, confirming successful hybrid entanglement preparation carrying OAM... introduces OAM degree of freedom into the hybrid entanglement and takes a crucial step towards hybrid quantum information processing with multiple degrees of freedom"