The quantum bit or qubit is the elementary unit that can carry quantum information.
A quantum computer, like a classical computer, uses binary states to encode information. A quantum system can be in a resting state or an excited state
The quantum bit or qubit is the elementary unit that can carry quantum information. Just as 1 and 0 are the two states of an ordinary classical bit, a qubit is the superposition of at least two quantum states, which we represent here by blue and orange .