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Bulletin of the American Physical Society

Superconducting qubits with semiconductor nanowire Josephson junctions

Karl D. Petersson, T. W. Larsen, Ferdinand Kuemmeth, Thomas Sand Jespersen, Peter Krogstrup, Jesper Nygård, Charles M. Marcus

Published Mar 4, 2015• 0 citations
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Coherent operation of gate-voltage-controlled hybrid transmon qubits (gatemons) based on semiconductor nanowires was recently demonstrated. Here we experimentally investigate the anharmonicity in epitaxial InAs-Al Josephson junctions, a key parameter for their use as a qubit. Anharmonicity is found to be reduced by roughly a factor of 2 compared to conventional metallic junctions and dependent on gate voltage. Experimental results are consistent with a theoretical model, indicating that Josephson coupling is mediated by a small number of highly transmitting modes in the semiconductor junction.
This thesis project aims to construct optimal, tunable superconductor-semiconductor junctions for electronic quantum devices. Such junctions will be useful for solid state quantum computers where the tunability of the semiconducting element allows for new types of superconducting quantum bits (qubits). The archetypical device is the gate tunable Josephson junction that has recently been shown to work in different qubit architectures.Growth of semiconductor nanowires will be carried out in a III-V molecular beam epitaxy reactor and coat these with superconducting shells such as Al, Ta, and MoGe, several unexploited materials combinations will be tested. During the project I will also take part in device fabrication using these nanowires and low temperature measurement campaigns to probe superconductivity and quantum transport phenomena.