Ultrasensitive bolometers as detectors of single quanta

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School of Science | Doctoral thesis (article-based) | Defence date: 2023-12-01
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Date

2023

Department

Teknillisen fysiikan laitos
Department of Applied Physics

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Mcode

Degree programme

Language

en

Pages

56 + app. 74

Series

Aalto University publication series DOCTORAL THESES, 203/2023

Abstract

The development of precision detectors has been pivotal in advancing the field of physics, where accurate observation and measurement of natural phenomena are essential for understanding the laws of the universe. In this thesis, we consider superconducting quantum circuits (SQCs) to expand the toolbox of ultrasensitive detection methods. This thesis begins by investigating the hypothesis of an electric field effect on metallic superconductors which on one hand, contradicts current theories, but on the other hand, might open possibilities for novel applications in electric field detection within SQCs. We delve into the feasibility of electric-field detectors through resonator studies, aiming to shed light on the interaction between superconductors and external fields. We then dive into the world of bolometers, traditionally known for their effectiveness in photon detection. We consider their underutilized potential in the detection of electrons and their integration into more complex systems. Through qubit readout experiments and the exploration of single-electron detection, we stretch the boundaries of bolometer applications, aiming to widen their range of functionalities. Furthermore, we present an improved bolometer design that streamlines fabrication processes and optimizes device characteristics. This novel design paves the way for enhanced bolometric detection techniques within superconducting quantum circuits, increasing their accessibility and effectiveness in practical applications. This thesis paints a comprehensive picture of the versatile world of ultrasensitive metallic bolometers within SQCs. It offers novel insights, methodologies, and the promise of greater advances in precision detection, contributing to the broader advancement of superconducting quantum technology.

Description

Supervising professor

Möttönen, Mikko, Prof., Aalto University, Department of Applied Physics, Finland

Thesis advisor

Möttönen, Mikko, Prof., Aalto University, Department of Applied Physics, Finland

Keywords

bolometers, superconducting quantum circuits

Other note

Parts

  • [Publication 1]: G. Catto, W. Liu, S. Kundu, V. Lahtinen, V. Vesterinen, and M. Möttönen. Microwave response of a metallic superconductor subject to a high-voltage gate electrode. Scientific Reports, 12, 6822 (2022), April 2022.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202205173225
    DOI: 10.1038/s41598-022-10833-5 View at publisher
  • [Publication 2]: M. Casariego, E. Zambrini Cruzeiro, S. Gherardini, T. Gonzalez-Raya, R. André, G. Frazão, G. Catto, M. Möttönen, D. Datta, K. Viisanen, J. Govenius, M. Prunnila, K. Tuominen, M. Reichert, M. Renger, K. G. Fedorov, F. Deppe, H. van der Vliet, A. J. Matthews, Y. Fernández, R. Assouly, R. Dassonneville, B. Huard, M. Sanz, and Y. Omar. Propagating Quantum Microwaves: Towards Applications in Communication and Sensing. Quantum Science and Technology, 8, 023001, March 2023.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202304262858
    DOI: 10.1088/2058-9565/acc4af View at publisher
  • [Publication 3]: A. M. Gunyhó, S. Kundu, J. Ma, W. Liu, S. Niemelä, G. Catto, V. Vadimov, V. Vesterinen, P. Singh, Q. Chen, and M. Möttönen. Single-Shot Readout of a Superconducting Qubit Using a Thermal Detector. Submitted to Nature Electronics, April 2023
  • [Publication 4]: Q.-M. Chen, P. Singh, R. Duda, G. Catto, A. Keränen, A. Alizadeh, T. Mörstedt, A. Sah, A. M. Gunyhó, W. Liu, and M Möttönen. Compact inductor-capacitor resonators at sub-gigahertz frequencies. Physical Review Research, Accepted for publication, October 2023

Citation

Permanent link to this item

https://urn.fi/URN:ISBN:978-952-64-1548-2

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[diss] Perustieteiden korkeakoulu / SCI