Decoherence as a Phase Transition

This paper, authored by Aidan McGill in October 2024, proposes a novel reinterpretation of quantum decoherence by framing it as a physical phase transition in probability distributions. It challenges conventional interpretations, such as the Copenhagen and many-worlds theories, which rely on the concept of wave function "collapse" driven by an external observer or measurement. Key aspects of this framework include: Observer-Independent Decoherence: The model removes the necessity of an observer, proposing that classical behavior is an emergent property of quantum complexity rather than a separate reality. The Phase Transition Mechanism: Decoherence is defined as a transition in the probability distribution of a system's wave function, triggered when interactions with external systems cross a specific threshold of complexity. Information and Energy Dynamics: The shift from quantum to classical behavior is driven by informational exchanges and energy transfers between a system and its environment. Empirical Alignment: The framework is supported by real-world examples, including buckyball double-slit experiments and superconducting qubits, which demonstrate quantum effects in macroscopic systems. Consistency with the Born Rule: This reinterpretation maintains the probabilistic outcomes of standard quantum mechanics and remains fully consistent with the Born rule. By focusing on the intrinsic properties of system interactions, this work offers a unified view where quantum mechanics governs all scales, and classical reality is a byproduct of informational complexity.