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Physics
Josephson Effect & Shapiro Steps
Tunnel a Cooper pair through a 1-nm barrier: I_s = I_c sin φ, the phase races at 483.6 MHz per microvolt, and microwave drive locks it into voltage plateaus V_n = n·f_rf·Φ₀ — the physics behind the SI volt, SQUIDs and transmon qubits.
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