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Which risk increases when a Josephson junction's barrier thickness increases beyond optimal range?

A)Decreased superconductivity due to reduced electron tunneling
B)Increased junction capacitance limiting switching speed
C)Elevated thermal noise overwhelming signal detection
D)Enhanced back-tunneling intensifying quantum decoherence

💡 Explanation

When barrier thickness in a Josephson junction increases, quantum tunneling of Cooper pairs decreases because the probability exponentially decays with distance, diminishing supercurrent. Therefore decreased superconductivity arises, rather than increased capacitance or thermal noise which are affected by materials, or back-tunneling related to impedance mismatches.

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