IBM and University of Chicago claim quantum advantage with 70 logical qubits
IBM and University of Chicago researchers report a verified quantum-advantage experiment using 70 logical qubits.
IBM and University of Chicago researchers say they have demonstrated quantum advantage on encoded circuits, a result aimed at one of the field's hardest tests: showing a quantum computer can do useful verification-sensitive work beyond the practical reach of classical simulation.
The July 30 announcement centers on a paper titled Sampling hard circuits with verifiably high fidelity. According to IBM, the team used an error-correction method to run 70 logical qubits, 2,415 logical two-qubit operations and 468 logical T gates. The reported quantum run took about 15 minutes, while leading classical approaches would require infeasible time for the same task.
Why It Matters
Quantum-advantage claims are often controversial because the harder the experiment becomes, the harder it is to prove the answer is right. IBM says the experiment used a structured alternative to random circuit sampling that keeps the computational hardness test while allowing errors to be detected during the computation. The company also says the encoded computation achieved logical error rates 10 times lower than the physical error rates, increasing confidence in the result at larger circuit depth.
The work is not a commercial application by itself. It is a benchmark-style result, and it still comes from IBM and its academic collaborators rather than a broad independent consensus. But the emphasis on logical qubits, public circuits and verifiability makes the announcement notable because it tries to address both performance and trust at the same time.
IBM also pointed to related July 30 demonstrations with Qedma and Algorithmiq, plus an openly accessible Quantum Advantage Tracker where circuits and results can be examined. In the Qedma collaboration, IBM said error-mitigated quantum computers modeled dynamics in systems up to 74 qubits and were compared with classical methods run with RIKEN and BlueQubit resources. Those parallel announcements suggest IBM is trying to move quantum advantage from isolated laboratory milestones toward repeatable community benchmarks.
The next test will be scrutiny. Researchers outside the IBM ecosystem will need time to evaluate the paper, reproduce classical comparisons and challenge the tracker data. For now, the claim is a fresh marker that quantum hardware, error correction and validation methods are advancing together, even if practical enterprise uses remain further out.
Sources
Cover photo by Pachon in Motion on Pexels, used under the Pexels License.
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