Theory of Quantum-Classical Crossover: An Ontological Perspective

One of the still unresolved problems in modern physics is the conceptual gap between quantum mechanics and Newtonian classical physics. Quantum mechanics describes probabilistic and indeterminate systems, whereas classical physics describes stable and deterministic systems. This article proposes a preliminary ontological and philosophical framework to interpret the transition from the quantum to the classical state through the Theory of Quantum-Classical Crossover (TQCC). Rather than considering the two regimes as fundamentally distinct, the theory suggests they are stages of a single process: the gradual formation of physical reality from a state whose physical properties are not yet defined. The quantum-classical crossover is therefore not merely mathematical, but ontological. Although decoherence and coarse-graining are well-established mathematical formalisms, the Theory of Quantum-Classical Crossover provides a conceptual bridge between quantum indeterminacy and classical stability. It employs philosophical concepts as visual aids and integrates ideas such as Heisenberg’s potentia, Wheeler’s It from Bit, and Rovelli’s Relational Quantum Mechanics, suggesting that the binary state of matter is not only expected, but necessary. This ontological perspective may provide a conceptual bridge for understanding quantum-to-classical transitions beyond purely mathematical descriptions.