Quantum Superconducting EffectsAlthough many properties of superconductors can be described in macroscopic terms such as resistivity, heat capacity, critical temperature, etc., superconductivity is at base a quantum phenomenon and several interesting quantum effects arise. In 1961, two groups working independently discovered flux quantization  the fact that the magnetic flux through a superconducting ring is an integer multiple of a flux quantum. The Cooper pairs of a superconductor can tunnel through a thin insulating layer between two superconductors. This is the basis for the Josephson junction which is used in highspeed switching devices. 
Index Superconductivity concepts Reference Rohlf,Ch 15  

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Flux Quantization
More precise measurements using a SQUID magnetometer give a value for the flux quantum: 
Index Superconductivity concepts Reference Rohlf  

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