Which risk arises when using entangled photons for quantum key distribution over long distances through fiber?

💡 Explanation

When entangled photons travel long distances, environmental interactions induce decoherence because superposition states become corrupted, increasing the quantum bit error rate and compromising security. Therefore, decoherence increases bit error, rather than wavelength drift, polarization mode dispersion, or chromatic dispersion, which affect classical signal integrity differently.

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