Which problem arises in quantum cryptography when photons experience decoherence?

💡 Explanation

Decoherence destroys quantum entanglement, a cornerstone of quantum key distribution; it increases the bit error rate using the BB84 protocol; therefore, a secure key exchange fails rather than successful key transfer or undetectable eavesdropping, because entanglement becomes degraded preventing correlation.

• Which outcome usually occurs when a rapidly oscillating current passes through a parallel-plate capacitor?
• Which outcome results when increasing the plate separation in a charged parallel-plate capacitor?
• Which mechanism induces current flow within the metal core of a high-power transformer subjected to alternating magnetic fields?
• Which mechanism limits catalytic converter efficiency despite adequate temperature and stoichiometry control?
• Which consequence results when steric hindrance inhibits electron delocalization?
• Which outcome occurs when high-voltage AC transmission line capacitance increases significantly?