Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors

Abstract As superconducting quantum circuits scale to larger sizes, the problem of frequency crowding proves a formidable task. Here we present a solution for this problem in fixed-frequency qubit architectures. By systematically adjusting qubit frequencies post-fabrication, we show a nearly tenfold...

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Autores principales:	Jared B. Hertzberg, Eric J. Zhang, Sami Rosenblatt, Easwar Magesan, John A. Smolin, Jeng-Bang Yau, Vivekananda P. Adiga, Martin Sandberg, Markus Brink, Jerry M. Chow, Jason S. Orcutt
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/bd590554dbb8484da2c46979da671e20
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spelling	oai:doaj.org-article:bd590554dbb8484da2c46979da671e202021-12-02T15:10:54ZLaser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors10.1038/s41534-021-00464-52056-6387https://doaj.org/article/bd590554dbb8484da2c46979da671e202021-08-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00464-5https://doaj.org/toc/2056-6387Abstract As superconducting quantum circuits scale to larger sizes, the problem of frequency crowding proves a formidable task. Here we present a solution for this problem in fixed-frequency qubit architectures. By systematically adjusting qubit frequencies post-fabrication, we show a nearly tenfold improvement in the precision of setting qubit frequencies. To assess scalability, we identify the types of “frequency collisions” that will impair a transmon qubit and cross-resonance gate architecture. Using statistical modeling, we compute the probability of evading all such conditions, as a function of qubit frequency precision. We find that, without post-fabrication tuning, the probability of finding a workable lattice quickly approaches 0. However, with the demonstrated precisions it is possible to find collision-free lattices with favorable yield. These techniques and models are currently employed in available quantum systems and will be indispensable as systems continue to scale to larger sizes.Jared B. HertzbergEric J. ZhangSami RosenblattEaswar MagesanJohn A. SmolinJeng-Bang YauVivekananda P. AdigaMartin SandbergMarkus BrinkJerry M. ChowJason S. OrcuttNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 Jared B. Hertzberg Eric J. Zhang Sami Rosenblatt Easwar Magesan John A. Smolin Jeng-Bang Yau Vivekananda P. Adiga Martin Sandberg Markus Brink Jerry M. Chow Jason S. Orcutt Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
description	Abstract As superconducting quantum circuits scale to larger sizes, the problem of frequency crowding proves a formidable task. Here we present a solution for this problem in fixed-frequency qubit architectures. By systematically adjusting qubit frequencies post-fabrication, we show a nearly tenfold improvement in the precision of setting qubit frequencies. To assess scalability, we identify the types of “frequency collisions” that will impair a transmon qubit and cross-resonance gate architecture. Using statistical modeling, we compute the probability of evading all such conditions, as a function of qubit frequency precision. We find that, without post-fabrication tuning, the probability of finding a workable lattice quickly approaches 0. However, with the demonstrated precisions it is possible to find collision-free lattices with favorable yield. These techniques and models are currently employed in available quantum systems and will be indispensable as systems continue to scale to larger sizes.
format	article
author	Jared B. Hertzberg Eric J. Zhang Sami Rosenblatt Easwar Magesan John A. Smolin Jeng-Bang Yau Vivekananda P. Adiga Martin Sandberg Markus Brink Jerry M. Chow Jason S. Orcutt
author_facet	Jared B. Hertzberg Eric J. Zhang Sami Rosenblatt Easwar Magesan John A. Smolin Jeng-Bang Yau Vivekananda P. Adiga Martin Sandberg Markus Brink Jerry M. Chow Jason S. Orcutt
author_sort	Jared B. Hertzberg
title	Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
title_short	Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
title_full	Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
title_fullStr	Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
title_full_unstemmed	Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
title_sort	laser-annealing josephson junctions for yielding scaled-up superconducting quantum processors
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/bd590554dbb8484da2c46979da671e20
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Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors

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