{"id": "card_double_slit", "kind": "reference", "title": "The double-slit experiment — one source, many paths, one outcome", "body": "Light (and matter) sent through two slits from one source makes an interference pattern — the wave signature (fringe spacing Δy = λL/d). Yet it arrives in discrete hits whose probabilities are the squared amplitudes — the Born rule, P = |a|²/Σ|a|². And a single electron fired one at a time still builds the fringes — wave-particle duality (λ = h/p). One source, many potential paths, one outcome observed; what HAPPENS at the measurement (collapse, branching, pilot wave) is an empirically-equivalent Babel, declined, charted on the Schrödinger stick. Checkable here: optics.double_slit, quantum_computing.born_rule, optics.de_broglie. Cited: Young 1804, Jönsson 1961, Tonomura 1989.", "source": {"label": "The double-slit experiment (Young 1804; Jönsson 1961; Tonomura 1989)", "url": "", "authority_tier": "reference", "ref": "stick_the_double_slit_experiment"}, "shelf": "codex", "box": "optics", "bands": ["double slit", "interference", "fringe", "Born rule", "wave-particle duality", "de Broglie", "Young", "measurement", "optics", "quantum mechanics", "one map"], "subject": "The double-slit experiment — one source, many paths, one outcome", "connections": [{"to_card_id": "card_floor_optics", "relationship": "part_of", "evidence": "two-slit interference — the fringe spacing Δy = λL/d, wave optics"}, {"to_card_id": "card_floor_quantum_mechanics", "relationship": "connects_at", "evidence": "the measured outcome is the Born rule P = |a|²/Σ|a|² — superposition to one hit"}, {"to_card_id": "card_floor_the_capstone", "relationship": "connects_at", "evidence": "one source, many potential paths, one outcome observed"}, {"to_card_id": "card_k_floor_of_discovery", "relationship": "part_of", "evidence": "a proven result on the one map, rooted in the Floor of Discovery"}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "call": "codex.optics", "facets": {"subject": ["Born rule", "Young", "de Broglie", "double slit", "fringe", "interference", "measurement", "one map", "quantum mechanics", "wave-particle duality"]}, "presentation": {"glyph": "•", "kind_label": "optics", "by": "The double-slit experiment (Young 1804; Jönsson 1961; Tonomura 1989)", "authority": "reference", "posted": "", "standing": ""}, "neighbors": [{"id": "card_floor_optics", "title": "Optics — how light bends, focuses, and slows", "relationship": "part of", "why": "two-slit interference — the fringe spacing Δy = λL/d, wave optics", "href": "/card/card_floor_optics", "resolved": true}, {"id": "card_floor_quantum_mechanics", "title": "Quantum mechanics — the quantum and its limits", "relationship": "connects at", "why": "the measured outcome is the Born rule P = |a|²/Σ|a|² — superposition to one hit", "href": "/card/card_floor_quantum_mechanics", "resolved": true}, {"id": "card_floor_the_capstone", "title": "The capstone — one source, many potentials, one end", "relationship": "connects at", "why": "one source, many potential paths, one outcome observed", "href": "/card/card_floor_the_capstone", "resolved": true}, {"id": "card_k_floor_of_discovery", "title": "The Floor of Discovery — one floor, and by its design the fear of God", "relationship": "part of", "why": "a proven result on the one map, rooted in the Floor of Discovery", "href": "/card/card_k_floor_of_discovery", "resolved": true}], "house": {"door": "FIND", "kind": "card", "trail": "connections", "seal": "/card/card_double_slit", "next_step": {"do": "follow a connection: what this card rests on, and what rests on it", "door": "FIND", "tool": "card_connections", "params": {"id": "card_double_slit"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}