Alice makes a measurement of her qubit, obtaining—with equal probabilities—either | 0 ⟩ {\displaystyle |0\rangle } or | 1 ⟩ {\displaystyle |1\rangle } . Because of the qubits' entanglement, Bob must now get exactly the same measurement as Alice; i.e., if she measures a | 0 ⟩ {\displaystyle |0\rangle } , Bob must measure the same, as | 00 ⟩ {\displaystyle |00\rangle } is the only state where Alice's qubit is a | 0 ⟩ {\displaystyle |0\rangle } . Entanglement also allows multiple states (such as the Bell state mentioned above) to be acted on simultaneously, unlike classical bits that can only have one value at a time.