Greenberger–Horne–Zeilinger state
HIGHLY ENTANGLED QUANTUM STATE OF 3 OR MORE QUBITS
GHZ state; Greenberger-Horne-Zeilinger state; GHZM
In physics, in the area of quantum information theory, a Greenberger–Horne–Zeilinger state (GHZ state) is a certain type of entangled quantum state that involves at least three subsystems (particle states, qubits, or qudits). It was first studied by Daniel Greenberger, Michael Horne and Anton Zeilinger in 1989.