Quantum physics already feels like a puzzle, but now scientists have made it more literal. A team of mathematicians from the University of Colorado Boulder has designed a quantum Rubik's cube, with infinite possible states and some weird new moves available to solve it. The classic (and classical) Rubik's cube is what's known as a permutation puzzle, which requires players to perform certain actions to rearrange one of a number of possible permutations into a 'solved' state. In the case of the i...