  High-dimensional quantum states have already settled their advantages in
different quantum technology applications. However, their reliable transmission
in fiber links remains an open challenge that must be addressed to boost their
application, e.g. in the future quantum internet. Here, we prove how path
encoded high-dimensional quantum states can be reliably transmitted over a 2 km
long multicore fiber, taking advantage of a phase-locked loop system
guaranteeing a stable interferometric detection.
