IBM Reports Largest Entangled State to Date, Achieving 0.56 Fidelity on 120 Superconducting Qubits

IBM Quantum researchers have successfully prepared the largest Greenberger–Horne–Zeilinger (GHZ) state reported to date, consisting of 120 superconducting qubits. The experiment, detailed in a paper titled “Big cats: entanglement in 120 qubits and beyond,” achieved a measured fidelity of 0.56(3), surpassing the 0.5 threshold required to confirm genuine multipartite entanglement across all qubits. The resource […]

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