W state

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The W state is an entangled quantum state that has the following shape: |W\rangle = \frac{1}{\sqrt{3}}(|001\rangle + |010\rangle + |100\rangle)

[edit] Properties

An interesting property of the W state is that it can leave an entangled 2-qubit system after measuring one of its qubits. This is robust entanglement contrary to the Greenberger-Horne-Zeilinger state which is fragile.

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