University of Oulu

Tuorila, J., Stockburger, J., Ala-Nissila, T., Ankerhold, J., Möttönen, M. (2019) System-environment correlations in qubit initialization and control. Physical review research, 1 (1), 013004. doi:10.1103/PhysRevResearch.1.013004

System-environment correlations in qubit initialization and control

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Author: Tuorila, Jani1,2; Stockburger, Jürgen3; Ala-Nissila, Tapio1,4,5;
Organizations: 1QCD Labs and MSP Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland
2Nano and Molecular Materials Research Unit, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
3Institute for Complex Quantum Systems and IQST, University of Ulm, D-89069 Ulm, Germany
4Department of Physics, Brown University, Box 1843, Providence, Rhode Island 02912-1843, USA
5Interdisciplinary Centre for Mathematical Modelling, Department of Mathematical Sciences, Loughborough University, Loughborough LE11 3TU, United Kingdom
6VTT Technical Research Centre of Finland, QTF Centre of Excellence, P.O. Box 1000, FI-02044 Aalto, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.2 MB)
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Language: English
Published: American Physical Society, 2019
Publish Date: 2020-02-18


The impressive progress in fabricating and controlling superconducting devices for quantum information processing has reached a level where reliable theoretical predictions need to account for quantum correlations that are not captured by the conventional modeling of contemporary quantum computers. This applies particularly to the qubit initialization as the process which crucially limits typical operation times. Here, we employ numerically exact methods to study realistic implementations of a transmon qubit embedded in electromagnetic environments focusing on the most important system-reservoir correlation effects such as the Lamb shift and entanglement. For the qubit initialization we find a fundamental trade-off between speed and accuracy which sets intrinsic constraints in the optimization of future reset protocols. Instead, the fidelities of quantum logic gates can be sufficiently accurately predicted by standard treatments. Our results can be used to accurately predict the performance of specific setups and also to guide future experiments in probing low-temperature properties of qubit reservoirs.

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Series: Physical review research
ISSN: 2643-1564
ISSN-E: 2643-1564
ISSN-L: 2643-1564
Volume: 1
Issue: 1
Article number: 013004
DOI: 10.1103/PhysRevResearch.1.013004
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Copyright information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.