“Our experiments show absolutely that errors are correlated, but as we identify problems and develop a deep physical understanding, we’re going to find ways to work around them. The construction and investigation of QBECCs have received far less attention, compared to the development of standard QECCs or entanglement-assisted QECCs 13, 5, 14, 6, 15, 16, 17.Many important questions remain open. “I think people have been approaching the problem of error correction in an overly optimistic way, blindly making the assumption that errors are not correlated,” says UW–Madison physics Professor Robert McDermott, member of the Wisconsin Quantum Institute and senior author of the study. A scalable architecture for quantum information processors, called SAQIP, is proposed and a flow is presented to map and schedule a quantum circuit on this architecture, which decreases the average latency and the average area of quantum circuits. The researchers report their findings in a study published June 16 in the journal Nature, Importantly, their work also points to mitigation strategies. For the most part, schemes designed to correct errors in quantum computers assume that the errors across qubits are uncorrelated they’re. the exponential decay of correlations of errors seems to be an idealization. Now, researchers at the University of Wisconsin–Madison have found evidence that errors are correlated across an entire superconducting quantum computing chip - highlighting a problem that must be acknowledged and addressed in the quest for fault-tolerant quantum computers. Additionally, the team linked tiny error-causing perturbations in the qubits’ charge state to the absorption of cosmic rays, a finding that already is impacting how quantum computers are designed. ory of fault-tolerant quantum error correction (FTQEC) is rather daunt. Quantum computers could outperform classical computers at many tasks, but only if the errors that are an inevitable part of computational tasks are isolated rather than widespread events.
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