It's statistics but instead of operations preserving the 1-norm (item weights [probabilities] add up to 1) they preserve the 2-norm (squared item weights [ampli

It's statistics but instead of operations preserving the 1-norm (item weights [probabilities] add up to 1) they preserve the 2-norm (squared item weights [amplitudes] add up to 1). Instead of using stochastic matrices you use unitary matrices. Everything else about quantum computing follows (...with sufficient elbow grease).