A Semiconductor Nanowire-Based Superconducting Qubit

Abstract

We introduce a hybrid qubit based on a semiconductor nanowire with an epitaxially grown superconductor layer. Josephson energy of the transmon-like device ("gatemon") is controlled by an electrostatic gate that depletes carriers in a semiconducting weak link region. Strong coupling to an on-chip microwave cavity and coherent qubit control via gate voltage pulses is demonstrated, yielding reasonably long relaxation times (0.8 μs) and dephasing times (1 μs), exceeding gate operation times by two orders of magnitude, in these first-generation devices. Because qubit control relies on voltages rather than fluxes, dissipation in resistive control lines is reduced, screening reduces crosstalk, and the absence of flux control allows operation in a magnetic field, relevant for topological quantum information.

References in corpus (13)

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• Charge insensitive qubit design derived from the Cooper pair box
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• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
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• Epitaxy of Semiconductor-Superconductor nanowires
• Tunable Supercurrent Through Semiconductor Nanowires
• Generating Single Microwave Photons in a Circuit
• Hard gap in epitaxial semiconductor-superconductor nanowires
• Realization of microwave quantum circuits using hybrid superconducting-semiconducting nanowire Josephson elements
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• Characterization and reduction of microfabrication-induced decoherence in superconducting quantum circuits

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