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Efficient assessment of process fidelity

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Title: Efficient assessment of process fidelity
Authors: Greenaway, S
Sauvage, F
Khosla, KE
Mintert, F
Item Type: Journal Article
Abstract: The accurate implementation of quantum gates is essential for the realisation of quantum algorithms and digital quantum simulations. This accuracy may be increased on noisy hardware through the variational optimisation of gates, however the experimental realisation of such a protocol is impeded by the large effort required to estimate the fidelity of an implemented gate. With a hierarchy of approximations we find a faithful approximation to the quantum process fidelity that can be estimated experimentally with reduced effort. Its practical use is demonstrated with the optimisation of a three-qubit quantum gate on a commercially available quantum processor.
Issue Date: 7-Jul-2021
Date of Acceptance: 25-May-2021
URI: http://hdl.handle.net/10044/1/90054
DOI: 10.1103/PhysRevResearch.3.033031
ISSN: 2643-1564
Publisher: American Physical Society
Start Page: 1
End Page: 15
Journal / Book Title: Physical Review Research
Volume: 3
Copyright Statement: © 2021 The Author(s). 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.
Keywords: quant-ph
Notes: 13 pages, 9 figures
Publication Status: Published
Online Publication Date: 2021-07-07
Appears in Collections:Quantum Optics and Laser Science
Faculty of Natural Sciences

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