Macroscopic Quantum Physics and Gravity: Qubits and SQUIDs in Relativistic Coherent Vacuum Gravity Theory

This preprint examines macroscopic quantum systems, specifically superconducting qubits and SQUIDs within the framework of the Relativistic Coherent Vacuum Gravity Theory (rCVGT). Macroscopic quantum devices demonstrate that quantum coherence can persist in systems involving billions of electrons, occupying a regime traditionally viewed as intermediate between microscopic quantum physics and classical behavior. While standard quantum mechanics and superconducting circuit theory successfully describe these systems operationally, their existence raises foundational questions about the physical origin, stability, and breakdown of quantum coherence at macroscopic scales. In rCVGT, quantum coherence is interpreted as a physical property of a structured relativistic vacuum rather than as a purely abstract state-vector attribute. Within this perspective, macroscopic quantum states correspond to extended, low-entropy coherent vacuum configurations stabilized by superconducting order. Decoherence and measurement are interpreted as physical processes involving the degradation of vacuum coherence, consistent with (but ontologically deeper than) standard environment-induced decoherence descriptions. This work does not modify the operational form or experimentally validated predictions of quantum mechanics, superconducting circuit theory, or general relativity in the regimes considered. All standard results for qubits, SQUIDs, and macroscopic quantum tunneling remain unchanged. Instead, the paper provides a coherent physical interpretation that integrates macroscopic quantum phenomena with the vacuum-based ontology of rCVGT. The preprint is intended as a conceptual and interpretive supplement to the main rCVGT framework, clarifying how macroscopic quantum coherence, measurement, and classicality naturally fit into a vacuum-coherence-based description of gravity and spacetime. It stands independently, while supporting the broader rCVGT research program linking quantum mechanics, gravity, and emergent physical time.