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...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2021-02-01
|
| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-020-00359-x |
| _version_ | 1818846111019827200 |
|---|---|
| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-19T05:40:21Z |
| format | Article |
| id | doaj.art-3b37dcae019c4d01a0436488037e361b |
| institution | Directory Open Access Journal |
| issn | 2056-6387 |
| language | English |
| last_indexed | 2024-12-19T05:40:21Z |
| publishDate | 2021-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Information |
| spelling | doaj.art-3b37dcae019c4d01a0436488037e361b2022-12-21T20:34:01ZengNature Portfolionpj Quantum Information2056-63872021-02-01711610.1038/s41534-020-00359-xQuantum sensors for microscopic tunneling systemsAlexander Bilmes0Serhii Volosheniuk1Jan David Brehm2Alexey V. Ustinov3Jürgen Lisenfeld4Physikalisches Institut, Karlsruhe Institute of TechnologyPhysikalisches Institut, Karlsruhe Institute of TechnologyPhysikalisches Institut, Karlsruhe Institute of TechnologyPhysikalisches Institut, Karlsruhe Institute of TechnologyPhysikalisches Institut, Karlsruhe Institute of TechnologyAbstract 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.https://doi.org/10.1038/s41534-020-00359-x |
| spellingShingle | Alexander Bilmes Serhii Volosheniuk Jan David Brehm Alexey V. Ustinov Jürgen Lisenfeld Quantum sensors for microscopic tunneling systems npj Quantum Information |
| title | 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_short | Quantum sensors for microscopic tunneling systems |
| title_sort | quantum sensors for microscopic tunneling systems |
| url | https://doi.org/10.1038/s41534-020-00359-x |
| work_keys_str_mv | AT alexanderbilmes quantumsensorsformicroscopictunnelingsystems AT serhiivolosheniuk quantumsensorsformicroscopictunnelingsystems AT jandavidbrehm quantumsensorsformicroscopictunnelingsystems AT alexeyvustinov quantumsensorsformicroscopictunnelingsystems AT jurgenlisenfeld quantumsensorsformicroscopictunnelingsystems |