Which outcome limits quantum key distribution (QKD) distance using entangled photons through optical fiber?

💡 Explanation

When entangled photons travel through optical fibers, photon absorption causes exponential signal loss because the fiber material interacts with photons, attenuating the transmitted signal and destroying entanglement. Therefore distance limitation occurs, rather than increased error, noise, or saturation which would require different limiting factors involving decoherence and detection.

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