In quantum computing, a qubit (/ˈkjuːbɪt/) or quantum bit is the basic unit of quantum information—the quantum version of the classical binary bit physically realized with a two-state device. A qubit is a two-state (or two-level) quantum-mechanical system, one of the simplest quantum systems displaying the peculiarity of quantum mechanics. Examples include: the spin of the electron in which the two levels can be taken as spin up and spin down; or the polarization of a single photon in which the two states can be taken to be the vertical polarization and the horizontal polarization. In a classical system, a bit would have to be in one state or the other. However, quantum mechanics allows the qubit to be in a coherent superposition of both states simultaneously, a property which is fundamental to quantum mechanics and quantum computing.

Ok, enough wikipedia. Enjoy the song :)

(P.D.: Sorry for it being too short, best I could do before start doing all the IRL stuff I've got to do. If I come up with some inspiration I guess I could make an extended version of this.)