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A quantum superposition of magnetic flux states in a SQUID is called macroscopic quantum coherence ( MQC ). Because the currents are built of billions of electrons coherently circulating within a superconducting ring.
If a magnetic flux bias applied to a SQUID which is equal to φ ij / 2 ( where φ 0 ＝ πh/e ＝ 2.07 × 10＾−15 Wb is a magnetic flux quantum, h is a Plank’s constant, e is an electron charge ), its potential energy has two symmetric minima.
