  The state-of-the-art physics consists of two irreconcilable branches, i.e.,
the quantum theory and the general relativity, which work well in their own
territories, independently. However, what are quantum and spacetime after all?
The key question was never addressed, satisfactorily. In this work, we describe
a possibility to reformulate the quantum theory in the Minkowski spacetime from
the viewpoint of classic physics in the Euclidean spacetime, i.e., classic
mechanics and stochastic process theory. We show that quantum theory and
Minkowski spacetime may connect with each other and emerge from a single
fundamental entity.
