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← ScienceWhich consequence arises because photon entanglement verification loses correlation?
A)Secure keyspace distribution fails✓
B)Qubit superposition fidelity increases
C)Decoherence timescales become shorter
D)Refractive index dispersion is minimised
💡 Explanation
Secure keyspace distribution fails because entanglement-based QKD relies on photon pairs sharing perfectly correlated quantum states; any loss of the *correlation collapse* therefore reduces security, rather than increased superposition, because decoherence is independent under ideal operating conditions.
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