In the double-slit experiment, particles are sent one at a time toward two slits and a detection screen. With both slits open and no which-path information, an interference pattern appears — as if each particle went through both slits. Introducing measurement that reveals which slit the particle used destroys that pattern in steps described by complementarity. This demo lets you vary measurement strength and compare how different quantum interpretations describe the same statistics.

• γ slider / complementarity circle — measurement strength; more which-path information means less fringe visibility.
• Transport bar — play, pause, scrub the particle animation; speed and reset.
• Right panel — parameters (slits, wavelength), interpretation text, measurement narrative.
• Keyboard — 1–0 switch interpretations (see list in the interpretation menu), Space play/pause on the canvas, ] collapse/expand the side panel.

Home page — Double Slit Experiment

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