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Which outcome occurs when a Josephson junction ages?

A)Critical current density decreases irreversibly
B)Resonance frequency becomes highly predictable
C)Thermal noise averages towards zero kelvin
D)Tunnel barrier width remains perfectly uniform

💡 Explanation

In a Josephson junction aging leads to degradation of the insulating barrier because oxidation introduces defects; therefore, the critical current density (dependent on electron tunneling) decreases irreversibly rather than increasing, because the junction's conductive properties degrade.

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