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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
Realizing an Andreev Spin Qubit: Exploring Sub-Gap Structure in Josephson Nanowires Using Circuit Qed

Realizing an Andreev Spin Qubit: Exploring Sub-Gap Structure in Josephson Nanowires Using Circuit Qed

Hays, Max

Hardcover

Series: Springer Theses

Technology & EngineeringGeneral ComputersPhysics

ISBN10: 3030838781
ISBN13: 9783030838782
Publisher: Springer Nature
Published: Dec 1 2021
Pages: 184
Weight: 1.04
Height: 0.50 Width: 6.14 Depth: 9.21
Language: English

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.

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