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Field Engineering | Masters in Physics All things agentic
Shorts
Schrödinger's Box — The experiment In 1935, Schrödinger proposed the cat as a complaint. A particle in superposition was tolerable; wire it to a vial of acid and a cat, and the absurdity was supposed to be obvious — a joke about taking quantum mechanics too literally. History kept the box and threw away the punchline. Ninety years later the cat is the most famous animal in physics, remembered as a question with exactly two answers: alive or dead. In June, Oxford took the framing apart. Saner et al., Phys. Rev. X 16, 021049: a single trapped strontium ion, sculpted by mid-circuit measurement into superpositions whose components are squeezed, trisqueezed, quadsqueezed — states with no classical counterpart at all. Sixfold symmetry in the Wigner function. Negativity confirmed. Not two answers. Not answers that even resemble the classical world. The building of the box in superposition physics Schrödinger's Box is a live phase-space experiment in the browser. A cat state you can sculpt, and an instrument honest enough to check. The physics, specifically: 1 — The state is real. An equal superposition of N coherent states on a ring in phase space, |ψ⟩ = 𝒩·S(r)·Σₖ|α·e^(i(2πk/N+φ))⟩. Every readout on the site is computed from this state vector, every frame. Nothing is typed in. 2 — The interference is the point. The Wigner function is evaluated on a 96×96 grid with all cross terms kept. Those cross terms are the fringes between the lobes — drop them and you have an ordinary mixture, a cat that is merely either. Where W goes negative, no classical probability distribution can follow. That negativity is the certificate of superposition: for a two-lobe cat ours converges to 0.3175 against the textbook 1/π ≈ 0.318. 3 — Measurement is done honestly. Pressing OBSERVE draws one sample from the marginal P(x) = ∫W dp — the actual Born rule, not a coin flip wearing its costume. Repeat it and your histogram converges to the distribution it came from. We test this on every load with a Kolmogorov–Smirnov statistic; the error shrinks as n^(−1/2), as the Dvoretzky–Kiefer–Wolfowitz inequality demands. 4 — Decoherence is watchable. Coherences decay by the photon-loss form, e^(−0.15κ·|αⱼ−αₖ|²): distant branches lose their fringes first. Push κ and watch the betweenness die while the lobes survive. That is why real cats don't superpose — and you can watch the negativity fall to zero as it happens. 5 — The numbers check out to machine precision. The study log runs six numerical experiments against published theory on every page load, reproducible from a seed. Wehrl entropy of the coherent reference: 1 + ln π, matched to 8×10⁻¹⁴. Entropy excess: exactly ln N until the lobes physically overlap. Sub-Planck fringe scaling: exponent 0.955 against Zurek's predicted 1. And one honest null: the Mandel Q parameter comes out ≈ 0 — the standard photon-statistics test is blind to this kind of non-classicality, which is exactly why negativity, not Q, is the witness. The thesis: The binary was never in the physics — it was an assumption we packed into the box in 1935 and never took back out. Superposition doesn't mean two options. It means the space between classical outcomes is inhabited, and its occupants owe the classical world nothing. The simulation The whole repo is open sourced to welcome any challenges to its limitations in physics.
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