Which mechanism limits stable quantum key distribution using entangled photons through fiber optic cable?

💡 Explanation

When entangled photons propagate through fiber, photon decoherence occurs due to interactions with fiber impurities causing loss of entanglement and disruption of correlation, fundamentally limiting achievable key exchange distances based on quantum mechanics. Therefore, decoherence leads to failed key distribution, rather than drifts, dispersion and birefringence overcome through standard optical compensations.

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