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. 2015 Jul 6;5:11591. doi: 10.1038/srep11591

Figure 1.

Figure 1

(a) depicts an interferometer for a spin-Inline graphic particle with spin oriented along Inline graphic propagating through two beam-splitters (BS) and picking up a relative phase χ. In (b) the Bloch’s sphere is depicted and shows how a given interferometric setup changes the initial spin. Depending on the initial spin the interferometer reveals “wave-particle” property, quantified by the visibility, or “which-way” information, quantified by the predictability. Both quantities add up to one for pure spin states.