ETH Zurich researchers demonstrate 17,000-qubit array with 99.91% fidelity

Researchers at ETH Zurich have demonstrated a quantum computing system containing 17,000 qubits that achieved operational fidelity of 99.91%, marking a significant advancement in the stability of quantum operations. The breakthrough, published on Thursday, addresses one of the fundamental challenges in quantum computing: maintaining coherent quantum states long enough to perform useful calculations. Quantum systems are notoriously susceptible to environmental interference that causes errors. The ETH Zurich team developed what they describe as a new stabilization technique that allows the large qubit array to maintain high fidelity across operations. The 99.91% fidelity rate represents a substantial improvement over previous demonstrations at comparable scale. The research brings practical quantum computing closer to reality. While quantum processors with thousands of qubits have been demonstrated before, maintaining high operational fidelity across the entire system has remained elusive. Error rates must be reduced further before quantum computers can outperform classical systems on commercially relevant problems. The demonstration adds to Switzerland's growing profile in quantum research and technology. ETH Zurich has emerged as a leading center for quantum science, with the work potentially influencing the trajectory of quantum computing development globally. Industry observers noted that while significant engineering challenges remain before such systems can be deployed commercially, the fidelity achievement represents genuine progress in a field that has seen considerable hype.