Quantum Absorption Refrigerator

A three-level quantum system wired to three independent heat baths can pump heat out of a cold reservoir using nothing but a temperature difference — no external work, no moving parts. This simulator solves the steady-state Pauli master equation for the exact rates set by your bath temperatures and level gaps, then animates the result as a swarm of independent particles making real stochastic quantum jumps between three energy shelves. Live readouts track the cooling power pulled from the cold bath, the coefficient of performance, and the entropy production rate, which the second law guarantees stays non-negative no matter how you set the sliders.