Quantum computing without interruptions

Researchers in Innsbruck and Aachen achieved a breakthrough by eliminating mid-circuit measurements—a major obstacle in quantum error correction—while executing fault-tolerant quantum algorithms. Using a trapped-ion quantum processor, the team demonstrated Grover’s search algorithm on three logical qubits without interruptions, proving universal fault-tolerant computation is possible without real-time measurements. The experiment marks the first successful implementation of a practical quantum algorithm on encoded qubits without relying on mid-circuit feedback, addressing a key challenge in scalable quantum computing. This approach simplifies error correction by avoiding the need for frequent measurements, which often introduce noise and complexity in quantum systems. The findings, published in April 2026, advance fault-tolerant quantum computing by offering a more robust framework for running algorithms on error-corrected qubits.