The walker carries a two-state spin. Each step a Hadamard coin mixes the spin, then the walker moves left or right according to it. The gold curve is a classical coin-flip walker from the same start.
Tap to change the starting spin. The same ?seed= always gives the same run.
LITThe discrete-time Hadamard quantum walk. Every step the total probability (quantum and classical) must be 1 to within 10−9, or the page throws.
AMBERA spin-½ coin returns to itself only after 720°; the walk uses the coin, not the rotation.