Coherence and nonlinearity in mechanical and josephson superconducting devices

Doctoral thesis (2018)

Authors

S. Yanai QN/Steele Lab - AS
Research Group
QN/Steele Lab (AS) (TU Delft)
Copyright: © 2018 S. Yanai
DOI: https://doi.org/10.4233/uuid:e107c39b-e0ed-4318-9780-207bae9df24d
Josephson junctions Nanotechnology Mechanical oscillators Parametric excitation SQUIDs TLSs Cavity optomechanics
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Published Date

2018

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Steele Lab

Abstract

In this thesis, the microwave detection of mechanically compliant objects is investigated. This starts with a system of a suspended metal drum capacitively coupled to a high impedance microstrip resonator. The mechanical non-linear dissipation of the drums is studied. Next, a suspended nanowire coupled to a CPW resonator is studied. With an electrostatic drive at twice the mechanical resonance frequency, there occurs a parametric excitation of either the mechanical signal or the coupled microwave resonance frequency of the cavity. Then the microwave loss in flux-tunable resonators is investigated for future experiments. One of the goals of this project was to couple a suspended nanowire with a SQUID loop of a flux tunable cavity. Here, the dielectric loss in flux tunable resonators is studied in order to optimize the design of future devices.