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Superconducting qubits – voltage tuned
Researchers from the SNI network have developed a new qubit platform that could be suitable for various applications. In contrast to conventional superconducting qubits made of metals, the team has combined a technologically relevant semiconductor with superconducting elements to create a "gatemon" qubit with promising properties.
The researchers from the Department of Physics at the University of Basel who were supported by the European grant TOPSQUAD, used an surprisingly simple method: With a commercial hotplate they fabricated a high-quality Josephson junction on a germanium/silicon nanowire between two superconductors – the heart of the new qubit. In a publication in "Nano Letters", the physicists show that the charge transport is dominated by just two quantum channels in the semiconducting nanowire, and demonstrate all relevant time-resolved quantum manipulations.
Since, in contrast to previous developments, this type of qubit is based on technologically relevant materials, and these nanowires exhibit a particularly strong spin-orbit interaction, the authors expect these qubits to find a wide range of applications.
Online publication in Nano Letters
Research team Prof. Christian Schönenberger