Interactive Experiments
Apps
Each app is a working simulation of a thought experiment from the book. The physics engines are tested independently; what you see is what the equations say.
From The Observer Problem
The Quantum Cat Flap
A single silver atom is prepared on the Bloch sphere, fired through a Stern–Gerlach magnet, and the deflection unlatches a flap. Move the environment sliders and watch what decoherence actually destroys — and what it leaves completely alone.
From The Observer Problem
Bertlmann's Cats
Monty and Casper are separated. In each room an observer picks one of two questions to ask. Try to make their answers correlate more strongly than 2. You will not manage it, and the reason why is the whole of Bell's theorem.
More experiments will be added as chapters are published.