Which limitation impacts quantum key distribution when fiber optic cable length expands due to thermal expansion?

💡 Explanation

When fibre optic cables expand, stress induced birefringence changes the polarization state of the photons. This alters their entanglement, causing reduced fidelity and therefore secure bit rate is lower. Reduced entanglement degrades key efficacy., rather than decoherence or increased polarisation drift requiring shorter transit distance.

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