Fast Qubit Control with a Quantum-Circuit Refrigerator

Thumbnail Image

Files

isbn9789526418995.pdf (20.8 MB)
Errata_Mörstedt.pdf (90.47 KB)

URL

Journal Title

Journal ISSN

Volume Title

School of Science | Doctoral thesis (article-based) | Defence date: 2024-07-05
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.

Authors

Date

2024

Department

Teknillisen fysiikan laitos
Department of Applied Physics

Major/Subject

Mcode

Degree programme

Language

en

Pages

84 + app. 92

Series

Aalto University publication series DOCTORAL THESES, 134/2024

Abstract

Superconducting circuits have emerged as powerful building blocks on the path toward a useful quantum computer. However, fast and accurate control over these circuits remains one of the key challenges. In particular, the fast initialization of superconducting qubits is a growing requirement in this era of constantly increasing qubit lifetimes. In this thesis, we investigate different means of qubit control in the context of dissipation engineering. We use a quantum-circuit refrigerator (QCR), an on-chip microcooler based on one or two normal-metal–insulator–superconductor junctions, to create a tunable environment for superconducting circuits. We present and compare two different realizations of this device, the double-junction QCR directly coupled to a transmon qubit and the single-junction QCR coupled to the qubit via a superconducting resonator. Beyond qubit reset, we explore other properties of the QCR, including the cooling and creation of exceptional points in superconducting resonators and the generation of thermal states in superconducting qubits. Through single-shot readout experiments, we gain insight into the quantum state of the qubit and its dynamics in response to different control signals. Combining the results of these experiments, we discuss the possible realization of a quantum heat engine using a QCR as a two-way tunable environment, extending the scope of applications toward the fundamental study of open quantum systems. This thesis sheds light on the versatile world of quantum-circuit refrigeration and presents novel insights, experiments, and applications. At the intersection of circuit quantum electrodynamics and quantum thermodynamics, the QCR promises further possibilities for advancement and increased understanding of the behavior and control of superconducting quantum systems.

Description

Supervising professor

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

Thesis advisor

Kundu, Suman, Dr., Department of Applied Physics, Aalto University

Keywords

quantum-circuit refrigerator, tunnel junction, photon-assisted tunneling, superconducting circuit, superconducting qubit, qubit reset

Other note

Parts

  • [Publication 1]: T. F. Morstedt, W. S. Teixeira, A. Viitanen, H. Kivijarvi, M. Tiiri,M. Rasola, A. Gunyho, S. Kundu, L. Lattier, V. Vadimov, G. Catelani,V. Sevriuk, J. Heinsoo, J. Rabina, J. Ankerhold, and M. Mottonen.Rapid on-demand generation of thermal states in superconductingquantum circuits. Submitted to Physical Review Letters,arXiv:2402.09594, February 2024.
  • [Publication 2]: T. F. Morstedt, A. Viitanen, V. Vadimov, V. Sevriuk, M. Partanen,E. Hyyppa, G. Catelani, M. Silveri, K. Y. Tan, and M. Mottonen. RecentDevelopments in Quantum-Circuit Refrigeration. ANNALENDER PHYSIK , 534, 2100543, May 2022.
    Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202208104494
    DOI: 10.1002/andp.202100543 View at publisher
  • [Publication 3]: V. A. Sevriuk, W. Liu, J. Ronkko, H. Hsu, F. Marxer, T. F. Morstedt,M. Partanen, J. Rabina, M. Venkatesh, J. Hotari, L. Gronberg,J. Heinsoo, T. Li, J. Tuorila, K. W. Chan, J. Hassel, K. Y. Tan, andM. Mottonen. Initial experimental results on a superconductingqubitreset based on photon-assisted quasiparticle tunneling. AppliedPhysics Letters, 121, 234002, December 2022.
    Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202212227239
    DOI: 10.1063/5.0129345 View at publisher
  • [Publication 4]: V. Vadimov, A. Viitanen, T. F. Morstedt, T. Ala-Nissila, and M. Mottonen.Single-junction quantum-circuit refrigerator. AIP Advances,12 (7): 075005, July 2022.
    Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202208104744
    DOI: 10.1063/5.0096849 View at publisher
  • [Publication 5]: W. S. Teixeira, V. Vadimov, T. F. Morstedt, S. Kundu, and M. Mottonen.Exceptional-point-assisted entanglement, squeezing, andreset in a chain of three superconducting resonators. PhysicalReview Research, 5.033119, August 2023.
    Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202310046166
    DOI: 10.1103/PhysRevResearch.5.033119 View at publisher
  • [Publication 6]: A. Viitanen, T. F. Morstedt,W. S. Teixeira, M. Tiiri, J. Rabina, M. Silveriand M. Mottonen. Quantum-circuit refrigeration of a superconductingmicrowave resonator well below a single quantum. Acceptedfor publication in Physical Review Research, arXiv:2308.00397,January 2024.
  • [Publication 7]: W. S. Teixeira, T. F. Morstedt, A. Viitanen, H. Kivijarvi, A. Gunyho,M. Tiiri, S. Kundu, A. Sah, V. Vadimov, and M. Mottonen. Fastexcited-state removal of a transmon qubit using a single-junctionquantum-circuit refrigerator and a two-tone microwave drive. Submittedto Scientific Reports, arXiv:2401.14912, January 2024.

Citation

Permanent link to this item

https://urn.fi/URN:ISBN:978-952-64-1899-5

Collections

[diss] Perustieteiden korkeakoulu / SCI