In a recent work published in Nature Communications, researchers reported the demonstration of measurement-free universal logical quantum computation. Working in close collaboration with experimental teams at the University of Innsbruck and Alpine Quantum Technologies GmbH in Innsbruck, Austria, the scientists theoretically proposed and experimentally demonstrated a universal toolbox of fault-tolerant logical operations on error-detecting codes without mid-circuit measurements on a trapped-ion quantum processor. This approach is complementary to contemporary quantum error correction protocols, as the new schemes avoid mid-circuit measurements with feed-forward control, which are challenging for qubit control, often slow, and susceptible to relatively high error rates. To showcase the capabilities of their method, the team fault-tolerantly implemented Grover’s quantum search algorithm on three logical qubits encoded within eight physical qubits. Their findings demonstrate the practical feasibility of measurement-free protocols and mark an important first step toward exploring this largely uncharted direction in quantum computation.

Publication: Butt, F., Pogorelov, I., Freund, R. et al. Demonstration of measurement-free universal logical quantum computation. Nat Commun 17, 995 (2026). https://doi.org/10.1038/s41467-026-68533-x

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