qubit state quantum information processing Dirac notation bit
Another example is a quantum logical qubit state, as used in quantum information processing, which is a quantum superposition of the "basis states" 




|

0
⟩


{\displaystyle |0\rangle }

 and 




|

1
⟩


{\displaystyle |1\rangle }

.
Here 




|

0
⟩


{\displaystyle |0\rangle }

 is the Dirac notation for the quantum state that will always give the result 0 when converted to classical logic by a measurement. Likewise 




|

1
⟩


{\displaystyle |1\rangle }

 is the state that will always convert to 1. Contrary to a classical bit that can only be in the state corresponding to 0 or the state corresponding to 1, a qubit may be in a superposition of both states. This means that the probabilities of measuring 0 or 1 for a qubit are in general neither 0.0 nor 1.0, and multiple measurements made on qubits in identical states will not always give the same result.
