Quantum+Spin


 * Quantum Spin **

Spin refers to the angular momentum of a quantum particle (how it spins about its axis). All electrons, for example. All electrons spin at the same rate and can never slow down or speed up. Their direction of spin is always a superposition of different directions if they are not looked at, in which case an axis and direction must be determined. What we regard as a 360 degree rotation of the electron will not take it back to its original quantum state. It takes two full rotations to do that.