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Which security risk increases when entanglement-based quantum key distribution has phase drift?

A)Increased side-channel information leakage
B)Photodetector efficiency quickly decreases
C)Qubit decoherence accelerates significantly
D)Communication range instantly drops tenfold

💡 Explanation

Side-channel leakage rises because phase drift in the photonic signal produces timing correlations, allowing adversaries deconstruct the encryption; entangled photons provide less security because of compromised key generation, therefore timing attacks prevail, rather than qubit decoherence hindering direct reading.

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