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New Quantum Record: Transmon Qubit Coherence Reaches Millisecond Threshold

FINLAND, JUL 8 – Aalto University physicists measured transmon qubit coherence times reaching a median of 0.5 milliseconds, surpassing previous records and enhancing quantum error correction potential.

  • In early July 2025, researchers from Aalto University’s Quantum Computing and Devices group reported achieving a transmon qubit echo coherence time reaching one millisecond, surpassing previous recorded benchmarks.
  • This breakthrough was achieved by mitigating environmental noise challenges through the production of high-quality transmon qubits using superconducting films provided by Finland’s main applied scientific research organization.
  • The team measured a maximum echo dephasing time of 1.057 milliseconds and a median coherence time of 0.5 milliseconds, surpassing previous records of around 0.6 milliseconds.
  • Professor Mikko Möttönen highlighted that this breakthrough enhances Finland’s role as a key player in quantum technology and emphasized that achieving coherence times in the millisecond range reduces the resources needed for error correction while allowing a greater number of quantum operations.
  • This milestone marks a significant advance toward scalable, fault-tolerant quantum computing and reinforces Finland's position in global quantum technology research.
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A quantum computer needs qubits that can compute for as long as possible. Qubits are susceptible to collapse from an important superposition.

·Helsinki, Finland
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Phys.org broke the news in United Kingdom on Tuesday, July 8, 2025.
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