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Which risk increases when entangled photons are subjected to differential phase shifts?

A)Decoherence impacting quantum key distribution
B)Increased spectral linewidth uncertainty
C)Reduced spontaneous parametric down-conversion
D)Enhanced second-harmonic generation efficiency

💡 Explanation

Decoherence increases because differential phase shifts introduce uncontrolled interactions with the environment causing loss of entanglement. Therefore coherence is lost, rather than parametric effects dominating which require stable quantum states.

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