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Reference.org
Greenberger–Horne–Zeilinger state
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<p>In <a href="/facts/Physics/a7aH2y08">physics</a>, in the area of <a href="/facts/Quantum_information_theory/Bl9QIvHj">quantum information theory</a>, a Greenberger–Horne–Zeilinger (GHZ) state is an <a href="/facts/Quantum_entanglement/afzslwN0">entangled</a> <a href="/facts/Quantum_state/7jbxd7Dx">quantum state</a> that involves at least three subsystems (particle states, <a href="/facts/Qubit/WveeEubw">qubits</a>, or <a href="/facts/Qudit/WveeEubw">qudits</a>). Named for the three authors that first described this state, the GHZ state predicts outcomes from experiments that directly contradict predictions by every classical local <a href="/facts/Hidden-variable_theory/02QP5Dxp">hidden-variable theory</a>. The state has applications in <a href="/facts/Quantum_computing/nbbcgmvq">quantum computing</a>. </p>