Waveguide bandgap engineering with an array of superconducting qubits

Abstract Waveguide quantum electrodynamics offers a wide range of possibilities to effectively engineer interactions between artificial atoms via a one-dimensional open waveguide. While these interactions have been experimentally studied in the few qubit limit, the collective properties of such syst...

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Autores principales:	Jan David Brehm, Alexander N. Poddubny, Alexander Stehli, Tim Wolz, Hannes Rotzinger, Alexey V. Ustinov
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/6ab1af1c8c33462fa7b7e364de40e3ad
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spelling	oai:doaj.org-article:6ab1af1c8c33462fa7b7e364de40e3ad2021-12-02T13:49:47ZWaveguide bandgap engineering with an array of superconducting qubits10.1038/s41535-021-00310-z2397-4648https://doaj.org/article/6ab1af1c8c33462fa7b7e364de40e3ad2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00310-zhttps://doaj.org/toc/2397-4648Abstract Waveguide quantum electrodynamics offers a wide range of possibilities to effectively engineer interactions between artificial atoms via a one-dimensional open waveguide. While these interactions have been experimentally studied in the few qubit limit, the collective properties of such systems for larger arrays of qubits in a metamaterial configuration has so far not been addressed. Here, we experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control coupled to the mode continuum of a waveguide. By consecutively tuning the qubits to a common resonance frequency we observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. Making use of the qubits quantum nonlinearity, we demonstrate control over the latter by inducing a transparency window in the bandgap region of the ensemble. The circuit of this work extends experiments with one and two qubits toward a full-blown quantum metamaterial, thus paving the way for large-scale applications in superconducting waveguide quantum electrodynamics.Jan David BrehmAlexander N. PoddubnyAlexander StehliTim WolzHannes RotzingerAlexey V. UstinovNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-5 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Jan David Brehm Alexander N. Poddubny Alexander Stehli Tim Wolz Hannes Rotzinger Alexey V. Ustinov Waveguide bandgap engineering with an array of superconducting qubits
description	Abstract Waveguide quantum electrodynamics offers a wide range of possibilities to effectively engineer interactions between artificial atoms via a one-dimensional open waveguide. While these interactions have been experimentally studied in the few qubit limit, the collective properties of such systems for larger arrays of qubits in a metamaterial configuration has so far not been addressed. Here, we experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control coupled to the mode continuum of a waveguide. By consecutively tuning the qubits to a common resonance frequency we observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. Making use of the qubits quantum nonlinearity, we demonstrate control over the latter by inducing a transparency window in the bandgap region of the ensemble. The circuit of this work extends experiments with one and two qubits toward a full-blown quantum metamaterial, thus paving the way for large-scale applications in superconducting waveguide quantum electrodynamics.
format	article
author	Jan David Brehm Alexander N. Poddubny Alexander Stehli Tim Wolz Hannes Rotzinger Alexey V. Ustinov
author_facet	Jan David Brehm Alexander N. Poddubny Alexander Stehli Tim Wolz Hannes Rotzinger Alexey V. Ustinov
author_sort	Jan David Brehm
title	Waveguide bandgap engineering with an array of superconducting qubits
title_short	Waveguide bandgap engineering with an array of superconducting qubits
title_full	Waveguide bandgap engineering with an array of superconducting qubits
title_fullStr	Waveguide bandgap engineering with an array of superconducting qubits
title_full_unstemmed	Waveguide bandgap engineering with an array of superconducting qubits
title_sort	waveguide bandgap engineering with an array of superconducting qubits
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6ab1af1c8c33462fa7b7e364de40e3ad
work_keys_str_mv	AT jandavidbrehm waveguidebandgapengineeringwithanarrayofsuperconductingqubits AT alexandernpoddubny waveguidebandgapengineeringwithanarrayofsuperconductingqubits AT alexanderstehli waveguidebandgapengineeringwithanarrayofsuperconductingqubits AT timwolz waveguidebandgapengineeringwithanarrayofsuperconductingqubits AT hannesrotzinger waveguidebandgapengineeringwithanarrayofsuperconductingqubits AT alexeyvustinov waveguidebandgapengineeringwithanarrayofsuperconductingqubits
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Waveguide bandgap engineering with an array of superconducting qubits

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