The result of the measurement will be either | 0 ⟩ {\displaystyle |0\rangle } , with probability | α | 2 {\displaystyle |\alpha |^{2}} , or | 1 ⟩ {\displaystyle |1\rangle } , with probability | β | 2 {\displaystyle |\beta |^{2}} . Measurement of the state of the qubit alters the values of α and β. For instance, if the result of the measurement is | 0 ⟩ {\displaystyle |0\rangle } , α is changed to 1 (up to phase) and β is changed to 0.