In physics, quantum spin is a mathematical construct applied to quantum particles. Like quantum waves, it is said to be imaginary so when electrons spin, nothing is assumed to actually spin, because if an electron is a particle with no size, how can it spin? And if it had a size, its edges would have to move faster than light to explain the observed effects. Physics calls quantum spin imaginary because it is physically impossible, but what if it isn’t? If the process behind a quantum wave is a transverse circle, there is no reason why it can’t actually spin.
QR3.7.1. The Curious Case of Quantum Spin
QR3.7.2. Quantum Directions
QR3.7.3. Polarization