Atom Interferometer Gravimeter

This simulator visualizes the working principle of a cold-atom absolute gravimeter — the same class of quantum sensor used for geodesy, cave and mineral surveying, and precision navigation. A cloud of ultracold atoms is split by a π/2 laser pulse into two coherent free-falling paths, redirected by a π pulse a time T later, and recombined by a final π/2 pulse another T after that. Because each pulse imprints a phase proportional to the atom's height at that instant, and gravity moves the two paths to different heights, the recombined population oscillates as a fringe of local gravitational acceleration g with phase Δφ = k_effgT² — exactly the formula real instruments invert to report g. Adjust g, the pulse separation T, and the effective laser wavelength to watch the fringe phase, transition probability, and gravitational sensitivity respond live.