In the race toward practical quantum computing, researchers in Finland have achieved a new milestone by extending the coherence times of a superconducting transmon qubit to near one millisecond, shattering previous records and bringing us a step closer to fault-tolerant quantum computation.
In a newly published study in Nature Communications, scientists from Aalto University and the VTT Technical Research Centre of Finland report that their transmon qubit demonstrated energy relaxation and echo dephasing times well beyond any values previously reported for this type of qubit.
One of the devices achieved an echo dephasing time exceeding 1 millisecond (1.057 ms)—more than triple the best figures in recent literature.
“We have just measured an echo coherence time for a transmon qubit that landed at a millisecond at maximum with a median of half a millisecond,” study author and PhD student at Aalto University, Mikko Tuokkola, said in a press release. “The median reading is particularly significant, as it also surpasses current recorded readings.”
For context, coherence time refers to the duration during which a quantum bit, or qubit, can maintain its quantum state before succumbing to environmental noise and decoherence.
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