Bell state

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English[edit]

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Etymology[edit]

Named after John Stewart Bell (1928–1990), Irish physicist.

Noun[edit]

Bell state (plural Bell states)

  1. (quantum information science) One of a set of four entangled states, namely |\Phi^+\rangle = {1\over \sqrt{2}} ( |00\rangle + |11\rangle ) ,  |\Phi^-\rangle = {1\over \sqrt{2}} (|00\rangle - |11\rangle ),    |\Psi^+\rangle = {1\over \sqrt{2}} (|01\rangle + |10\rangle ), and |\Psi^-\rangle = {1 \over \sqrt{2}} (|01\rangle - |10\rangle ), where  |xy\rangle := |x\rangle \otimes |y\rangle ; these are the simplest examples of entangled states.