This manuscript revisits quantum entanglement from a quantum field–theoretic perspective,with the aim of clarifying its conceptual status rather than proposing a new theory. The central claim is that quantum entanglement need not be understood as a mysteriousnonlocal phenomenon.When quantum fields are taken as the primary physical entities, entanglement followsnaturally from the non-separable structure of global field excitations.What appears puzzling in particle-based descriptions is thus revealed to be an expectedfeature of field-based ontology combined with reduced descriptions. The paper emphasizes a structural reading of the wavefunction as a description of fieldexcitations, and interprets entanglement as a consequence of restricting access to aglobally defined state.Locality is preserved at the level of operators, and all empirical predictions of quantumfield theory remain unchanged. No new dynamics, interpretations, or empirical claims are introduced.Instead, the work makes explicit a conceptual perspective that is already implicit instandard quantum field theory but is rarely articulated in a unified and accessible form.Formal details supporting the argument are provided in an appendix, while the main textfocuses on conceptual clarity. This work is intended as a contribution to the foundations of quantum theory, clarifyingthe relationship between entanglement, locality, and field-theoretic structure.
HIDEYUKI CHINO (Thu,) studied this question.