where | Ψ Ψ ⟩ ⟩ is the quantum state of the qubit, and | 0 ⟩ ⟩ , | 1 ⟩ ⟩ denote particular solutions to the Schrödinger equation in Dirac notation weighted by the two probability amplitudes c 0 and c 1 that both are complex numbers. Here | 0 ⟩ ⟩ corresponds to the classical 0 bit, and | 1 ⟩ ⟩ to the classical 1 bit. The probabilities of measuring the system in the | 0 ⟩ ⟩ or | 1 ⟩ ⟩ state are given by | c 0 | 2 and | c 1 | 2 respectively (see the Born rule). Before the measurement occurs the qubit is in a superposition of both states.