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Active protection of a superconducting qubit with an interferometric Josephson isolator
Nonreciprocal microwave devices play critical roles in high-fidelity, quantum-nondemolition (QND) measurement schemes. They impose unidirectional routing of readout signals and protect the quantum systems from unwanted noise originated by the output chain. However, cryogenic circulators and isolator...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6637130/ https://www.ncbi.nlm.nih.gov/pubmed/31316071 http://dx.doi.org/10.1038/s41467-019-11101-3 |
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author | Abdo, Baleegh Bronn, Nicholas T. Jinka, Oblesh Olivadese, Salvatore Córcoles, Antonio D. Adiga, Vivekananda P. Brink, Markus Lake, Russell E. Wu, Xian Pappas, David P. Chow, Jerry M. |
author_facet | Abdo, Baleegh Bronn, Nicholas T. Jinka, Oblesh Olivadese, Salvatore Córcoles, Antonio D. Adiga, Vivekananda P. Brink, Markus Lake, Russell E. Wu, Xian Pappas, David P. Chow, Jerry M. |
author_sort | Abdo, Baleegh |
collection | PubMed |
description | Nonreciprocal microwave devices play critical roles in high-fidelity, quantum-nondemolition (QND) measurement schemes. They impose unidirectional routing of readout signals and protect the quantum systems from unwanted noise originated by the output chain. However, cryogenic circulators and isolators are disadvantageous in scalable superconducting architectures because they use magnetic materials and strong magnetic fields. Here, we realize an active isolator formed by coupling two nondegenerate Josephson mixers in an interferometric scheme and driving them with phase-shifted, same-frequency pumps. By incorporating our Josephson-based isolator into a superconducting qubit setup, we demonstrate fast, high-fidelity, QND measurements of the qubit while providing 20 dB of protection within a bandwidth of 10 MHz against amplified noise reflected off the Josephson amplifier in the output chain. A moderate reduction of 35% is observed in T(2E) when the Josephson-based isolator is turned on. Such a moderate degradation can be mitigated by minimizing heat dissipation in the pump lines. |
format | Online Article Text |
id | pubmed-6637130 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-66371302019-07-19 Active protection of a superconducting qubit with an interferometric Josephson isolator Abdo, Baleegh Bronn, Nicholas T. Jinka, Oblesh Olivadese, Salvatore Córcoles, Antonio D. Adiga, Vivekananda P. Brink, Markus Lake, Russell E. Wu, Xian Pappas, David P. Chow, Jerry M. Nat Commun Article Nonreciprocal microwave devices play critical roles in high-fidelity, quantum-nondemolition (QND) measurement schemes. They impose unidirectional routing of readout signals and protect the quantum systems from unwanted noise originated by the output chain. However, cryogenic circulators and isolators are disadvantageous in scalable superconducting architectures because they use magnetic materials and strong magnetic fields. Here, we realize an active isolator formed by coupling two nondegenerate Josephson mixers in an interferometric scheme and driving them with phase-shifted, same-frequency pumps. By incorporating our Josephson-based isolator into a superconducting qubit setup, we demonstrate fast, high-fidelity, QND measurements of the qubit while providing 20 dB of protection within a bandwidth of 10 MHz against amplified noise reflected off the Josephson amplifier in the output chain. A moderate reduction of 35% is observed in T(2E) when the Josephson-based isolator is turned on. Such a moderate degradation can be mitigated by minimizing heat dissipation in the pump lines. Nature Publishing Group UK 2019-07-17 /pmc/articles/PMC6637130/ /pubmed/31316071 http://dx.doi.org/10.1038/s41467-019-11101-3 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Abdo, Baleegh Bronn, Nicholas T. Jinka, Oblesh Olivadese, Salvatore Córcoles, Antonio D. Adiga, Vivekananda P. Brink, Markus Lake, Russell E. Wu, Xian Pappas, David P. Chow, Jerry M. Active protection of a superconducting qubit with an interferometric Josephson isolator |
title | Active protection of a superconducting qubit with an interferometric Josephson isolator |
title_full | Active protection of a superconducting qubit with an interferometric Josephson isolator |
title_fullStr | Active protection of a superconducting qubit with an interferometric Josephson isolator |
title_full_unstemmed | Active protection of a superconducting qubit with an interferometric Josephson isolator |
title_short | Active protection of a superconducting qubit with an interferometric Josephson isolator |
title_sort | active protection of a superconducting qubit with an interferometric josephson isolator |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6637130/ https://www.ncbi.nlm.nih.gov/pubmed/31316071 http://dx.doi.org/10.1038/s41467-019-11101-3 |
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