Phys.org  July 2, 2024 To achieve global quantum internet preparing and manipulating N-dimensional flying qudits as well as subsequently establishing their entanglement are still challenging tasks. A team of researchers in the US (University of Pennsylvania, Duke University, College of Staten Island) used an integrated approach, to explore the synergy from two degrees of freedom of light, spatial mode and polarization, to generate, encode, and manipulate flying structured photons and their formed qudits in a four-dimensional Hilbert space with high quantum fidelity, intrinsically enabling enhanced noise resilience and higher quantum data rates. The four eigen spin–orbit modes of their qudits […]