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Figures 1 and 2 combined. "A" illustrates the separation of either left/right or up/down spin components. If we take either the left or right spin electrons and pass them through the up/down separator, we lose our information about left/right spin. Similarly if we pass up or down spin electrons through a left/right separator, electrons in either the left or right stream will be found to have randomized the up/down component.
In "B," we take right spin electrons, feed them through an up/down separator, but reflect the streams back into a mixing box thus losing any information on up/down spin. If the electrons from the mixing box are then passed through a left/right separator they are found to be 100% right spin.
However blocking the path of the "up" stream electrons so they do not enter the mixing box, then passing the electrons from the box through our left/right separator gives us a 50% mix of left/right spin electrons.
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