such state indicates that if the particle is measured to be in state | 0 ⟩ ⟩ , the particle took path | A ⟩ ⟩ ; analogously, if the particle is measured to be in state | 1 ⟩ ⟩ , the particle took path | B ⟩ ⟩ . The state | Φ Φ ⟩ ⟩ is called the postselected state.