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Quantum key distribution (QKD) based on entangled photon pairs holds thepotential for repeater-based quantum networks connecting clients over longdistance. We demonstrate long-distance entanglement distribution by means ofpolarisation-entangled photon pairs through two successive deployed 96 km-longtelecommunications fibres in the same submarine cable. One photon of each pairwas detected directly after the source, while the other travelled the fibrecable in both directions for a total distance of 192 km and attenuation of 48dB. The observed two-photon Bell state exhibited a fidelity 85% $\pm$ 2% andwas stable over several hours. We employed neither active stabilisation of thequantum state nor chromatic dispersion compensation for the fibre.

Passively stable distribution of polarisation entanglement over 192 km of deployed optical fibre