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21h ago

Aalto University Achieves 1-Millisecond Coherence in Transmon Qubits

Researchers published reproducible fabrication protocols that pave the way for more scalable superconducting quantum computing by lowering error-correction requirements.

© Close-up of individual design cells of a 300 mm quantum photonic wafer.
Quantum computer.
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Qubit Coherence

Overview

  • On July 8, 2025, Aalto University reported echo coherence peaks at 1 millisecond and a median of 0.5 milliseconds for a transmon qubit, shattering previous records.
  • Published in Nature Communications, the study details methods that extend the operational window for error-free quantum operations.
  • Qubits were fabricated by the Quantum Computing and Devices group using VTT superconducting film and processed in Micronova cleanrooms at Finland’s OtaNano facility.
  • The team released comprehensive fabrication and measurement protocols to ensure global replication and accelerate advances in quantum hardware.
  • Extended coherence times significantly reduce the overhead required for quantum error correction and bolster Finland’s leadership in quantum technology.