US EditionNew 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.
12 Articles
12 Articles
Aalto researchers set world record for qubit coherence time
Finnish scientists have set a new international benchmark in quantum computing by achieving a one-millisecond coherence time for a transmon qubit. The result, announced by Aalto University on Tuesday, was published in Nature Communications. It marks the longest coherence ever measured for this type of superconducting qubit. The experiment was conducted by the Quantum Computing and Devices (QCD) research group at Aalto University’s Department of …
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Towards practical quantum computers: transmon qubit with a lifetime approaching 0.5 milliseconds
Here we report a breakthrough in the fabrication of a long lifetime transmon qubit. We use tantalum films as the base superconductor. By using a dry etching process, we obtained transmon qubits with a best T1 lifetime of 503 μs. As a comparison, we also fabricated transmon qubits with other popular materials, including niobium and aluminum, under the same design and fabrication processes. After characterizing their coherence properties, we found…
A quantum computer needs qubits that can compute for as long as possible. Qubits are susceptible to collapse from an important superposition.
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