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Which readout error increases when entangled photons decohere?

A)Superdense coding channel collapse
B)Quantum key distribution vulnerability
C)Quantum teleportation fidelity declines
D)Entanglement swapping efficiency drops

💡 Explanation

Quantum teleportation relies fundamentally upon established entanglement; decoherence disrupts the quantum circuit because it destroys the entangled state during signal translation; therefore fidelity diminishes, rather than affecting denser coding or key exchange protocols involving other particles.

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