Quantum Lenses for the Macroscopic World: Metaphorical Interpretations and Generalized Applications of Quantum Entanglement

Quantum entanglement has long been regarded as a defining feature of the microscopic domain. Recent progress across superconducting circuits, Bose–Einstein condensates, optmechanics, and continuous‑variable optics has revealed controllable, observable macroscopic quantum correlations, triggering renewed interest in entanglement across scales. This article reviews the conceptual migration from micro‑ to macro‑entanglement, synthesizes developments in experiment and theory, and introduces the metaphor of “relational entanglement” as a generalized analytical paradigm. We employ tools such as mutual information, entanglement entropy, and graph entropy measures to characterize holistic correlations in complex systems. We further evaluate the feasibility, limits, and risks associated with extending quantum concepts to quantum technologies, complex‑systems modeling, and interdisciplinary applications. Issues related to decoherence, computational complexity, and methodological validity are examined through a structured assessment framework and falsifiable propositions. The paper concludes by outlining pathways for multiscale research and data‑driven validation.