IBM Quantum Processor Completes 110-Year Supercomputer Task in 19 Seconds

A computation that would take the world's fastest supercomputer 110 years to finish has just been completed in 19 seconds. Operating through a standard cloud connection, IBM's Nighthawk r2 quantum processor generated one million samples of a highly complex quantum state, executing a workload that fundamentally outpaces classical hardware.[1][2]

The achievement, detailed in a 2026 preprint on arXiv, centers on a benchmark known as random-circuit sampling. First author Tigran Sedrakyan, a theoretical condensed matter physicist at the US-based firm BlueQubit, led an international research team that pushed the commercially available 120-qubit processor to a new threshold.[1][2]

"To our knowledge, this is the first demonstration of quantum advantage for a vanilla random-circuit sampling on a commercially and broadly accessible quantum processor that most non-expert quantum computer users can easily replicate," Sedrakyan and his colleagues wrote in the study.[1]

The researchers isolated a 61-qubit square-lattice subset of the Nighthawk r2 chip. They subjected these qubits to 36 cycles of randomized operations, utilizing 918 two-qubit entangling gates to create an increasingly complex and highly entangled quantum state.[2][3]

Measuring that state one million times took the quantum processor exactly 19 seconds. To understand the classical equivalent, the team used tensor-network contraction methods to estimate the burden on traditional silicon-based architecture.[1][2]

They calculated that reproducing those exact million samples classically would require approximately 1.2 × 10²⁷ machine operations. Even for Frontier, the US Department of Energy's exascale supercomputer capable of over one quintillion operations per second, that workload translates to roughly 110 years of continuous computing time.[1][3]

What distinguishes this 2026 milestone from previous quantum supremacy claims is the hardware's accessibility. The experiment was not conducted on a fragile, highly calibrated prototype in an isolated laboratory. Instead, the team accessed the Nighthawk r2 through IBM's standard cloud platform, using the same software stack available to commercial clients.[1][2]

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The researchers validated the quantum processor's accuracy using two independent fidelity estimators: mirror benchmarking and cross-entropy benchmarking across smaller circuit patches. These checks confirmed that the 19-second output maintained structural integrity and was not simply generating random noise.[3]

Classical computing researchers frequently develop algorithmic shortcuts that reduce the time required to simulate quantum circuits, meaning the 110-year estimate is not an absolute physical limit. However, the sheer scale of the 1.2 × 10²⁷ operation gap establishes a definitive margin where quantum hardware practically overtakes classical systems for this specific mathematical task.[1][3]

While random-circuit sampling is a specialized benchmark rather than a direct consumer application, the successful execution of 918 entangling gates demonstrates that cloud-based quantum systems can now handle deep, complex circuits reliably. The public release of the team's code and measurements allows independent researchers to verify the results, setting a new baseline for the quantum industry's capabilities.[2][4]