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IBM and researchers from the University of Chicago announced a quantum computing demonstration that meets the criteria for quantum advantage by performing computations beyond the reach of classical simulation while ensuring the results are accurate. The team achieved this by constructing encoded quantum circuits, enabling one of the largest logical quantum computations to date. The results have been openly released on the Quantum Advantage Tracker for verification by the research community.

The experiment addressed a longstanding challenge in quantum computing: verifying that a quantum computer’s output is correct without relying on assumptions about its internal workings. The researchers developed a structured alternative to random circuit sampling, a common benchmark, which retains the same computational hardness but allows for error detection during the process. This approach increases confidence that the quantum computer is solving a genuinely difficult problem.

In a significant error correction demonstration, the team executed 70 logical qubits, performing 2,415 logical two-qubit operations and 468 logical T gates. The encoded circuit achieved logical error rates 10 times lower than physical error rates, resulting in high fidelity even with large gate counts. Leading classical simulation methods struggled with the task, while the IBM quantum computer completed it in approximately 15 minutes.

IBM and the University of Chicago stated that this milestone marks a step toward scalable, trustworthy quantum computing. The work provides a foundation for scientists and businesses to rely on quantum computers for problems beyond classical reach. The University of Chicago emphasized that advances in verification could unlock practical applications for next-generation quantum computers.