Journal
Long-form notes, Qiskit experiments, and applied optimization thinking.
Why does measuring which slit an electron passes through destroy interference? The answer is not human observation or the electron somehow noticing a detector. A physical interaction correlates the electron's paths with different detector states. The overlap between those detector states directly controls the surviving interference.
Read note →The double-slit experiment becomes genuinely quantum when electrons are sent one at a time. A spread of detector hits alone does not prove wave behavior; the crucial evidence is interference between probability amplitudes associated with alternative paths. This note follows the questions of what interferes, where negative phase comes from, whether one electron involves both paths, and what happens when we measure which slit it passes through.
Read note →A spread of electron impacts does not by itself demonstrate wave behavior. The important observation is that opening two possible paths produces a probability distribution that is not simply the sum of the distributions from each path separately. This note follows the learner's questions from localized electron detections to the real meaning of quantum interference.
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