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← ScienceWhich constraint increases when spatially-separated entangled photons decohere?
A)Quantum key distribution becomes insecure.✓
B)Superconducting qubit coherence is amplified.
C)Entanglement swapping fidelity improves
D)Quantum computation gates synchronize better.
💡 Explanation
Insecure quantum key distribution arises because photon decoherence destroys the entanglement required for secure communication, rather than improving entanglement swapping, because the entangled state is corrupted. Therefore secure channels are not possible.
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