An illustration of Schr?dinger’s cat code, showing the superposition between "live" and "dead" states. (Courtesy: Vincenzo Savona/EPFL) An English proverb states, “A cat has nine lives. For three he plays, for three he strays, and for the last three he stays.” In the quantum world, however, objects can be in a superposition of states simultaneously. Therefore, a quantum cat could exist in a superposition of playing, straying, and staying all at once. Though the literal quantum cat might sound li...