Voltage-Controlled Semiconductor Hybrid Josephson Junctions

Quantum computing is an active field of research that holds promise to greatly increase computing power over existing computer architectures by using quantum mechanical phenomena. However, several technical hurdles still remain to realize practical quantum computers such as decoherence, which results in the loss of information.

Recent research by Luca Banszerus, W. Marshall, Christine Andersson, Tyler Lindemann, Michael Manfra, Charles Marcus, and Saulius Vaitiekenas achieved a nonsinusoidal element by using two voltage tunable sinusoidal Jospehson junctions in series. Nonsinusoidal Josephson elements have attracted considerable attention as they enable nonlinear circuits, resilient superconducting qubits, and nonreciprocal devices like Josephson diodes.

This work was performed in part using an STS-Elionix 7000 electron beam lithography system at the Center for Quantum Devices in the Niels Bohr Institute of the University of Copenhagen.

For more information see https://doi.org/10.48550/arXiv.2402.11603

josephson junction SEM image

Image: Color enhanced scanning electron micrograph of two separate parallel paths (gold arm 1 and gray arm 2), each consisting of two Josephson junctions in series (J1,J2 and J3,J4). The exposed semiconductor material is shown in green, while an epitaxial aluminum layer is shown in blue.