A New Kind of Quantum Junction

A New Kind of Quantum Junction

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A new type of quantum bit called a “phase-slip qubit,” devised by researchers at the RIKEN Advanced Science Institute and their collaborators, has enabled the world’s first-ever experimental demonstration of coherent quantum phase slip (CQPS). The groundbreaking result sheds light on an elusive phenomenon whose existence — a natural outcome of the hundred-year-old theory of superconductivity — has long been speculated, but never actually observed.

In a paper in Nature, the researchers report on the first direct observation of CQPS in a narrow superconducting wire of indium-oxide (InOx). The wire is inserted into a larger superconducting loop to form a new device called a phase-slip qubit, with the superconducting layer (the thin wire) sandwiched between insulating layers of empty space.

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