#complementarity

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A polarizing beamsplitter cube on a vibration-isolated optical bench forking a single beam into a bright transmitted path and a dimmer reflected path, a kinematic mount beside it caught mid-adjustment

Eight Nanoseconds Separate a Photon's Detection From the Choice That Retroactively Labels It

A photon lands on a detector and is recorded. Nanoseconds later, a choice about its entangled twin decides whether that already-recorded photon's data show a wave pattern or a definite path — read exactly, without the time-travel flourish.

By Brecht Corbeel · September 7, 2026 · 18 min read

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