Six channels of data with quantum OAM comb set new record

Researchers have demonstrated six-channel multicasting of data using orbital angular momentum (OAM). This limitation primarily arises from the challenge of directly modulating complex multiplexed OAM states, such as OAM combs, which typically requires bulky optical setups and complicated iteration algorithms. The team’s strategy enables the use of a single phase-only hologram to directly tailor multiple structured OAM combs, improving photon efficiency. Experimental validation through demonstrations with four, six, and eight channels shows the scalability of this approach for optical networks. A six-channel optical communication system, leveraging a novel hybrid intelligent strategy, has achieved real-time data transmission with a bit-error rate below 7 × 10⁻⁵, demonstrating six-channel OAM comb multicasting. This streamlined approach improves photon efficiency, a critical factor in scaling optical data…