Overview

• Aalto physicists measured an echo coherence time reaching 1 ms and a median of 0.5 ms for a superconducting transmon qubit.
• These figures surpass the previous record of roughly 0.6 ms and mark the first published transmon coherence measurement at the millisecond scale.
• The team’s Nature Communications article outlines step-by-step fabrication using VTT-supplied superconducting films and Micronova cleanroom processes.
• Extended coherence windows decrease the overhead for quantum error correction and enable more complex operations on noisy quantum platforms.
• The study solidifies Finland’s status as a leader in quantum technology and supports global reproducibility of high-fidelity qubit devices.