Quantum Entanglement Simulator (2D)

This 2D simulator recreates the classic EPR-Bohm thought experiment: two particles are prepared in a singlet or triplet entangled state and drawn far apart, each shown as an indeterminate "?" until measured. Clicking "Measure pair" collapses particle A into a random up/down spin along its detector axis, and particle B's spin along its own axis — tilted by the measurement-basis angle you choose — becomes correlated or anticorrelated instantly, regardless of the distance between them. Repeated trials build up a live correlation statistic that converges on the quantum-mechanical prediction E(θ) = ∓cos(θ), the same non-classical correlation measured in real Bell-inequality experiments.