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This experiment marks a critical milestone in quantum computing by successfully generating genuine multipartite entanglement across three logical qubits with 83% fidelity. By combining surface and 3D colour codes via lattice surgery, the team has demonstrated a viable path toward universal fault-tolerant operations essential for scalable quantum processors. This achievement validates theoretical benchmarks previously unattainable at the logical level, moving error correction from concept to verified practice.

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Researchers Generate Logical Genuine Multipartite Entanglement for Universal Quantum Computation

Quantum ZeitgeistJuly 20, 20265 min read

Twelve physical qubits now share a quantum link previously confined to theory. This experiment demonstrates genuine multipartite entanglement across three logical qubits, and reports a measurable fidelity of the resulting logical state, a first for this level of quantum complexity. Such a demonstration extends a benchmark for multi-qubit quantum devices to the logical level, serving as a first checkpoint for a fully operational quantum error correction circuit.

This work extends a benchmark for multi-qubit quantum devices to the logical level by creating and verifying entanglement between three logical qubits. This was achieved by combining two distinct quantum error-correction techniques using lattice surgery, a method of joining codes to enable more complex operations. They generated both standard and more complex entangled states, demonstrating a key step towards building more reliable quantum computers. Alex Steiner of the University of Innsbruck and colleagues from University of Vienna have, for the first time, generated and verified genuine multipartite entanglement between three logical qubits. This protection is…

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