Which effect limits quantum key distribution (QKD) networks using entangled photon pairs across long fiber optic cables?

💡 Explanation

When entangled photons travel through long fibers, photon decoherence occurs because imperfections in fibers cause interaction with the environment, destroying the delicate quantum state and breaking entanglement. Therefore limiting practical QKD, rather than polarization drift, amplification vulnerabilities, or dispersion which impact classical signals with intensity encoding.

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