the continuous becomes the cyclical
the continuous becomes the cyclical
A SQUID (Superconducting Quantum Interference Device) operates at the boundary where quantum mechanics forces the macroscopic world to behave discretely. Because the superconducting wavefunction must remain continuous around the loop, the magnetic flux threading it can only exist in exact integer multiples of the flux quantum ($\Phi_0$).
When a continuous, external magnetic field increases, the loop generates a screening current to fight the change, holding the flux at an integer. Eventually, the strain becomes too great, and the loop violently slips, snapping to the next quantum integer.
This interference converts an infinitely smooth, continuous magnetic field into a perfect, repeating, cyclical electrical voltage. The SQUID measures the continuous world by forcing it to run on a quantum treadmill, mapping a limitless progression into an endless cycle.
