Which limitation restricts transfer rate in quantum key distribution using entangled photons through fiber optic cable?

💡 Explanation

When entangled photons travel through fiber, environmental interactions cause decoherence because slightest disturbance collapses the entangled state, thus limiting the distance which entanglement can be maintained. Therefore, entanglement decoherence is the rate limiting factor rather than absorption, polarization drift or detector saturation, which are less directly causing destruction of fragile nature of entanglement.

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