Jiho Park

We propose and experimentally demonstrate a passive polarization stabilization method for robust entanglement distribution using a cross-aligned pair of polarization-maintaining fibers (PMFs). Unlike standard single-mode fiber links, the proposed configuration inherently mitigates polarization and phase fluctuations without active feedback control. Using polarization-entangled photon pairs generated from a Sagnac interferometer, we compare SMF-based transmission and the proposed PMF configuration under stable and mechanically perturbed conditions. While the SMF-based system shows severe degradation under vibration and fiber bending, with the average visibility dropping to 0.444, the proposed PMF configuration maintains a high average visibility of 0.867 with minimal fluctuation. These results demonstrate that the proposed approach enables reliable entanglement distribution under field conditions without complex active compensation, providing a practical route toward scalable quantum communication systems.