A general protocol for high-dimensional entangling gates is developed and applied for two four-dimensional qudits encoded in orbital angular momentum (OAM). The phase-locking technique stabilizes OAM sorters, leading to a process fidelity within a range from 0.71 to 0.85.
- Zhi-Feng Liu
- Zhi-Cheng Ren
- Hui-Tian Wang
