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Bell states

The Bell states are specific quantum states of two qubits that represent the simplest (and maximal) examples of quantum entanglement.

∣Φ±⟩=∣00⟩±∣11⟩2\vert\Phi^{\pm}\rangle =\frac{\vert 00 \rangle \pm \vert 11 \rangle}{\sqrt{2}}

∣Ψ±⟩=∣01⟩±∣10⟩2\vert\Psi^{\pm}\rangle =\frac{\vert 01 \rangle \pm \vert 10 \rangle}{\sqrt{2}}

For more information see the wikipedia page on Bell states.