Mesoscopic Superconductivity towards Protected Qubits

Thorvald Wadum Larsen

Abstract

Several unsolvable problems, such as molecular simulations of drugs, are predicted to be computable with a quantum computer. However, current state-of-the-art quantum bits, qubits, are error-prone making large computations impossible. This thesis presents results from experimental studies of three different approaches towards error-protected qubits based on novel semiconductor nanowires proximitized by an epitaxially grown aluminium shell.

First, we develop gatemons, a semiconductor-based superconducting qubit, as a viable qubit for quantum error correction. Next, we introduce a novel circuit architecture based on the high-transmission of semiconductor Josephson junction to create a protected 0-pi qubit. Finally, we demonstrate a high field compatible superconducting qubit for detection of Majorana states which are predicted to form protected qubits
Original languageEnglish
Place of PublicationKøbenhavn, Danmark
PublisherThe Niels Bohr Institute, Faculty of Science, University of Copenhagen
Publication statusPublished - 2018

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