This article proposes a realistic approach to entanglement by formulating the hypothesis that the photon is not a point-like entity, but a linear, vibrating particle endowed with energy, polarization, and spin: the photon-fibre.This material link between entangled particles ensures a continuity of state along its entire length.Thus, instantaneous entanglement correlations occur without invoking non-locality or the EPR paradox (Einstein, Podolsky and Rosen, 1935).Applied to the Casimir effect, this representation assigns an intrinsic tension to the photon- fibre, capable of accounting for the attraction measured between plates (Casimir, 1948). The model distinguishes two states: a mobile and luminous state before electronic docking, and an established, immobile and dark state after docking.The presence of established fibres throughout the universe provides a mechanism and an interpretation for vacuum energy and dark matter (Zwicky, 1933; Rubin and Ford, 1970). At the atomic scale and beyond, this network of stretched fibres connecting electrons from distinct atoms generates collective tractions likely to constitute quantum gravity.We thus observe that quantum gravity may be understood as the set of universal entanglements.Dark matter would correspond to immobilized fibres, and dark energy to the expansive tension of fibres that remain mobile.We further suggest that this model can be extended to other bosons, opening the way toward a conceptual unification of the fundamental forces.Cosmological evolution would then result from the gradual conversion of mobile fibres into the established state: free light slowly transforms into gravitational cohesion.This conversion governs the dynamics of cosmic expansion and the balance between gravity and dark energy.Validation of these hypotheses must involve empirical experiments investigating the specific signature of a linear particle, the docking phenomenon in the Casimir effect, and any possible attractive force between two entangled elements.The Fibre Theory thus presents itself as a unified program for reframing quantum interactions and certain cosmological observations on the basis of a single physical object: the fibre.Mots-clés : Fibre-photon, actionneur de force, continuité d’état, force photonique, statut mobile, statut établi, photon sombre, arrimage, Réseau Global UniverselKeywords: Fiber-photon, force actuator, state continuity, photonic force, mobile status, established status, dark photon, docking, Universal Global Network.