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← ScienceWhich mechanism enables persistent current flow in superconducting Josephson junctions?
A)Macroscopic quantum phase coherence✓
B)Increased lattice phonon interactions
C)Enhanced quasiparticle tunneling currents
D)Suppressed magnetic flux quantization
💡 Explanation
Persistent current flow arises because macroscopic quantum phase coherence creates a stable, non-dissipative state. Therefore, current circulates indefinitely, rather than decaying due to resistance arising from electron scattering.
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