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Which mechanism primarily enables a Josephson junction's functionality?

A)Quantum tunneling of Cooper pairs
B)Ohmic resistance across a barrier
C)Dielectric breakdown of insulator layer
D)Thermal emission of charge carriers

💡 Explanation

The supercurrent flow in a Josephson junction arises from quantum tunneling, because Cooper pairs tunnel through a thin insulating barrier. Therefore, supercurrent exists, rather than resistance-limited current, as temperature constraints allow condensate stability.

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