The novel design for the new qubit uses the chemical element tantalum in tandem with a special silicon substrate, creating what researchers say are the most coherent superconducting qubits to date.

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Source: https://www.livescience.com/technology/computing/record-breaking-feat-means-information-lasts-15-times-longer-in-new-kind-of-quantum-processor-than-those-used-by-google-and-ibm