Quantum sensors for microscopic tunneling systems

Abstract The anomalous low-temperature properties of glasses arise from intrinsic excitable entities, so-called tunneling Two-Level-Systems (TLS), whose microscopic nature has been baffling solid-state physicists for decades. TLS have become particularly important for micro-fabricated quantum device...

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Autores principales:	Alexander Bilmes, Serhii Volosheniuk, Jan David Brehm, Alexey V. Ustinov, Jürgen Lisenfeld
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/3b37dcae019c4d01a0436488037e361b
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spelling	oai:doaj.org-article:3b37dcae019c4d01a0436488037e361b2021-12-02T14:06:33ZQuantum sensors for microscopic tunneling systems10.1038/s41534-020-00359-x2056-6387https://doaj.org/article/3b37dcae019c4d01a0436488037e361b2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41534-020-00359-xhttps://doaj.org/toc/2056-6387Abstract The anomalous low-temperature properties of glasses arise from intrinsic excitable entities, so-called tunneling Two-Level-Systems (TLS), whose microscopic nature has been baffling solid-state physicists for decades. TLS have become particularly important for micro-fabricated quantum devices such as superconducting qubits, where they are a major source of decoherence. Here, we present a method to characterize individual TLS in virtually arbitrary materials deposited as thin films. The material is used as the dielectric in a capacitor that shunts the Josephson junction of a superconducting qubit. In such a hybrid quantum system the qubit serves as an interface to detect and control individual TLS. We demonstrate spectroscopic measurements of TLS resonances, evaluate their coupling to applied strain and DC-electric fields, and find evidence of strong interaction between coherent TLS in the sample material. Our approach opens avenues for quantum material spectroscopy to investigate the structure of tunneling defects and to develop low-loss dielectrics that are urgently required for the advancement of superconducting quantum computers.Alexander BilmesSerhii VolosheniukJan David BrehmAlexey V. UstinovJürgen LisenfeldNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-6 (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 Alexander Bilmes Serhii Volosheniuk Jan David Brehm Alexey V. Ustinov Jürgen Lisenfeld Quantum sensors for microscopic tunneling systems
description	Abstract The anomalous low-temperature properties of glasses arise from intrinsic excitable entities, so-called tunneling Two-Level-Systems (TLS), whose microscopic nature has been baffling solid-state physicists for decades. TLS have become particularly important for micro-fabricated quantum devices such as superconducting qubits, where they are a major source of decoherence. Here, we present a method to characterize individual TLS in virtually arbitrary materials deposited as thin films. The material is used as the dielectric in a capacitor that shunts the Josephson junction of a superconducting qubit. In such a hybrid quantum system the qubit serves as an interface to detect and control individual TLS. We demonstrate spectroscopic measurements of TLS resonances, evaluate their coupling to applied strain and DC-electric fields, and find evidence of strong interaction between coherent TLS in the sample material. Our approach opens avenues for quantum material spectroscopy to investigate the structure of tunneling defects and to develop low-loss dielectrics that are urgently required for the advancement of superconducting quantum computers.
format	article
author	Alexander Bilmes Serhii Volosheniuk Jan David Brehm Alexey V. Ustinov Jürgen Lisenfeld
author_facet	Alexander Bilmes Serhii Volosheniuk Jan David Brehm Alexey V. Ustinov Jürgen Lisenfeld
author_sort	Alexander Bilmes
title	Quantum sensors for microscopic tunneling systems
title_short	Quantum sensors for microscopic tunneling systems
title_full	Quantum sensors for microscopic tunneling systems
title_fullStr	Quantum sensors for microscopic tunneling systems
title_full_unstemmed	Quantum sensors for microscopic tunneling systems
title_sort	quantum sensors for microscopic tunneling systems
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3b37dcae019c4d01a0436488037e361b
work_keys_str_mv	AT alexanderbilmes quantumsensorsformicroscopictunnelingsystems AT serhiivolosheniuk quantumsensorsformicroscopictunnelingsystems AT jandavidbrehm quantumsensorsformicroscopictunnelingsystems AT alexeyvustinov quantumsensorsformicroscopictunnelingsystems AT jurgenlisenfeld quantumsensorsformicroscopictunnelingsystems
_version_	1718391955837157376

Quantum sensors for microscopic tunneling systems

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