The experiment that Steinberg and his team conducted was analogous to the standard 2-slit experiment. They used photons rather than electrons, and instead of sending those photons through a pair of slits, they passed through a beam splitter, a device that directs a photon along one of 2 paths, depending on the photon’s polarization. The photons eventually reach a single-photon camera (equivalent to the screen in the traditional experiment) that records their final position. The question “Which of 2 slits did the particle pass through?” becomes “Which of 2 paths did the photon take?”

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