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

A new quantum bit (qubit) that combines the spins of electrons trapped in semiconductor quantum dots and the electromagnetic modes of superconducting circuits is demonstrated in this thesis. This qubit has the potential to inherit beneficial aspects of both and could be used for spin detection and coherent spin manipulation. The results are crucial for the development of Majorana-based topological information processing.

Format: Paperback / softback
Length: 184 pages
Publication date: 02 December 2022
Publisher: Springer Nature Switzerland AG

Here is the rephrased text:

A groundbreaking thesis presents the first experimental realization of a novel quantum bit (qubit), a groundbreaking innovation that seamlessly combines two highly promising physical implementations for the storage and manipulation of quantum information. These implementations include the electromagnetic modes of superconducting circuits and the spins of electrons confined within semiconductor quantum dots. This novel qubit is constructed by harnessing the spin of a single superconducting quasiparticle, which is confined within a Josephson junction formed by a semiconductor nanowire. The remarkable feature of this qubit lies in the interplay between spin-orbit coupling within the nanowire and the supercurrent flowing through it. By carefully manipulating the spin state of the quasiparticle, it becomes possible to achieve both spin detection and coherent spin manipulation.

Furthermore, this thesis represents a significant leap forward in our understanding and control of Andreev levels, microscopic fermionic modes that play a fundamental role in the Josephson effect and are also the progenitors of Majorana modes in semiconductor nanowire junctions. The outcomes of this research hold immense significance for the development of Majorana-based topological information processing, a field with the potential to revolutionize computing and communication.

In summary, this thesis showcases a groundbreaking fusion of two promising physical implementations for quantum information storage and manipulation. By harnessing the spin of a superconducting quasiparticle in a Josephson junction formed by a semiconductor nanowire, it opens up new avenues for spin-based quantum computing and sensing. The results obtained in this thesis have the potential to transform our understanding of superconductivity and pave the way for the development of revolutionary technologies.

Weight: 326g
Dimension: 235 x 155 (mm)
ISBN-13: 9783030838812
Edition number: 1st ed. 2021