Realizing an Andreev Spin Qubit: Exploring Sub-gap Structure in Josephson Nanowires Using Circuit QED...

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Max Hays

Realizing an Andreev Spin Qubit

Exploring Sub-gap Structure in Josephson Nanowires Using Circuit QED

Max Hays

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English

Springer Nature Switzerland AG
02 December 2022

Condensed matter physics (liquid state & solid state physics); Quantum physics (quantum mechanics & quantum field theory); Semi-conductors & super-conductors; Mathematical theory of computation

Series: Springer Theses

The thesis gives the first experimental demonstration of a new quantum bit (“qubit”) that fuses two promising physical implementations for the storage and manipulation of quantum information – the electromagnetic modes of superconducting circuits, and the spins of electrons trapped in semiconductor quantum dots – and has the potential to inherit beneficial aspects of both. This new qubit consists of the spin of an individual superconducting quasiparticle trapped in a Josephson junction made from a semiconductor nanowire. Due to spin-orbit coupling in the nanowire, the supercurrent flowing through the nanowire depends on the quasiparticle spin state. This thesis shows how to harness this spin-dependent supercurrent to achieve both spin detection and coherent spin manipulation. This thesis also represents a significant advancement to our understanding and control of Andreev levels and thus of superconductivity. Andreev levels, microscopic fermionic modes that exist in all Josephson junctions, are the microscopic origin of the famous Josephson effect, and are also the parent states of Majorana modes in the nanowire junctions investigated in this thesis. The results in this thesis are therefore crucial for the development of Majorana-based topological information processing.

By: Max Hays
Imprint: Springer Nature Switzerland AG
Country of Publication: Switzerland
Edition: 2021 ed.
Dimensions: Height: 235mm, Width: 155mm,
Weight: 326g
ISBN: 9783030838812
ISBN 10: 3030838811
Series: Springer Theses
Pages: 184
Publication Date: 02 December 2022
Audience: Professional and scholarly , Undergraduate
Format: Paperback
Publisher's Status: Active

Max Hays was born in Asheville, North Carolina in the United States. He received his BS in Physics from the University of North Carolina at Chapel Hill, where he worked on a neutrinoless double-beta decay experiment known as the MAJORANA demonstrator. In the fall of 2014, Max joined the lab of Michel Devoret at Yale University, where he performed the experiments presented in this thesis. He currently lives in Cambridge, Massachusetts with his wife Radha, and works in the Engineering Quantum Systems group led by Will Oliver at MIT.