The fundamental difference between conventional and quantum physics is the issue concerning quantum entanglement, which is the essence of quantum mechanics that is absent from classical mechanics.
It is possible to find instances where measurements of entangled particles' physical characteristics, such as orientation, momentum, rotation, and polarization, are fully synchronized.
For instance, if a pair of entangled particles is created with known zero total spin, and one particle is shown to have clockwise rotation on an initial axis, the other particle's spin is observed to be anticlockwise when examined on the identical axis. But these actions and measurements have seemingly counterintuitive results.