SimReal SimReal - Physics - Quantum Physics - Spin Spin A quantum particle electron has two possible spin states independent of the measurement direction: - Up (indicated by +) - Down (indicated by -) In the three axis directions we therefor have 6 different spin states: x+, x-, y+, y-, z+, z-. It can be shown that all these 6 different spin states can be described by linear combinations of the two states z+ and z-. In the simulation window we have a spinning quantum particle (default spin state: y-). Use the radiobuttons to visualize the 6 different spin states. Mark the checkbox 'Rotation' to see the spinning of the particle.