Realizing an Andreev Spin Qubit : exploring sub-gap structure in Josephson nanowires using circuit QED / Max Hays.

Format:

Book

Author/Creator:

Hays, Max, author.

Series:

Springer theses 2190-5061

Springer theses, 2190-5061

Language:

English

Subjects (All):

Quantum electrodynamics.

Nanowires.

Genre:

Electronic books.

Physical Description:

1 online resource (xxiii, 184 pages) : illustrations (some color).

Place of Publication:

Cham, Switzerland : Springer, 2021.

System Details:

text file

Summary:

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.

Contents:

Part 1: Key concepts and contributions

Chapter 1: Introduction

Chapter 2: Andreev levels

Chapter 3: Probing Andreev levels with cQED

Chapter 4: Unlocking the spin of a quasiparticle

Chapter 5: Future directions

Part 2 The beautiful, messy details

Chapter 6: BCS superconductivity

Chapter 7: Andreev reflection, Andreev levels, and the Josephson effect

Chapter 8: Andreev levels in Josephson nanowires

Chapter 9: What would happen in a topological weak link?

Chapter 10: The device

Chapter 11: Spectroscopy and dispersive shifts

Chapter 12: Raman transitions of the quasiparticle spin

Chapter 13: Interactions of Andreev levels with the environment

Chapter 14: Unexplained observations.

Notes:

"Doctoral Thesis accepted by Yale University, USA."

Includes bibliographical references.

Online resource; title from PDF title page (SpringerLink, viewed January 6, 2022).

ISBN:

9783030838799

303083879X

OCLC:

1291204871

Access Restriction:

Restricted for use by site license.