Engineering the microwave to infrared noise photon flux for superconducting quantum systems

Danilin, S. , Barbosa, J., Farage, M., Zhao, Z., Shang, X., Burnett, J., Ridler, N., Li, C. and Weides, M. (2022) Engineering the microwave to infrared noise photon flux for superconducting quantum systems. EPJ Quantum Technology, 9, 1. (doi: 10.1140/epjqt/s40507-022-00121-6)

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Abstract

Electromagnetic filtering is essential for the coherent control, operation and readout of superconducting quantum circuits at milliKelvin temperatures. The suppression of spurious modes around transition frequencies of a few GHz is well understood and mainly achieved by on-chip and package considerations. Noise photons of higher frequencies – beyond the pair-breaking energies – cause decoherence and require spectral engineering before reaching the packaged quantum chip. The external wires that pass into the refrigerator and go down to the quantum circuit provide a direct path for these photons. This article contains quantitative analysis and experimental data for the noise photon flux through coaxial, filtered wiring. The attenuation of the coaxial cable at room temperature and the noise photon flux estimates for typical wiring configurations are provided. Compact cryogenic microwave low-pass filters with CR-110 and Esorb-230 absorptive dielectric fillings are presented along with experimental data at room and cryogenic temperatures up to 70 GHz. Filter cut-off frequencies between 1 to 10 GHz are set by the filter length, and the roll-off is material dependent. The relative dielectric permittivity and magnetic permeability for the Esorb-230 material in the pair-breaking frequency range of 75 to 110 GHz are measured, and the filter properties in this frequency range are calculated. The estimated dramatic suppression of the noise photon flux due to the filter proves its usefulness for experiments with superconducting quantum systems.

Item Type:Articles
Additional Information:The authors are thankful for the support from the European Research Council (ERC) under the Grant Agreement No. 648011, the Engineering and Physical Sciences Research Council (EPSRC) under the Grant Agreements No. EP/T018984/1 and No. EP/T001062/1, the Scottish Research Partnership in Engineering (SRPe) under the Grant Agreement NMIS-IDP/025 and Seeqc UK LIMITED for a studentship (JB).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Li, Professor Chong and Zhao, Mr Zimo and Barbosa, Joao and Farage, Michael and Weides, Professor Martin and Danilin, Dr Sergey
Authors: Danilin, S., Barbosa, J., Farage, M., Zhao, Z., Shang, X., Burnett, J., Ridler, N., Li, C., and Weides, M.
College/School:College of Science and Engineering
College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:EPJ Quantum Technology
ISSN:2196-0763
ISSN (Online):2196-0763
Published Online:15 January 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in EPJ Quantum Technology 9:1
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
308130Entangled quantum sensors: enhanced precision at the Heisenberg limitMartin WeidesEngineering and Physical Sciences Research Council (EPSRC)EP/T018984/1ENG - Electronics & Nanoscale Engineering
306059EPSRC Hub for Quantum Computing and SimulationMartin WeidesEngineering and Physical Sciences Research Council (EPSRC)EP/T001062/1ENG - Electronics & Nanoscale Engineering