Large gain quantum-limited qubit measurement using a two-mode nonlinear cavity
We provide a thorough theoretical analysis of qubit state measurement in a setup where a driven, parametrically-coupled cavity system is directly coupled to the qubit, with one of the cavities having a weak Kerr nonlinearity. Such a system could be readily realized using circuit QED architectures. W...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2014-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/16/11/113032 |
| _version_ | 1827874252109381632 |
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| author | S Khan R Vijay I Siddiqi A A Clerk |
| author_facet | S Khan R Vijay I Siddiqi A A Clerk |
| author_sort | S Khan |
| collection | DOAJ |
| description | We provide a thorough theoretical analysis of qubit state measurement in a setup where a driven, parametrically-coupled cavity system is directly coupled to the qubit, with one of the cavities having a weak Kerr nonlinearity. Such a system could be readily realized using circuit QED architectures. We demonstrate that this setup is capable in the standard linear-response regime of both producing a highly amplified output signal while at the same time achieving near quantum-limited performance: the measurement backaction on the qubit is near the minimal amount required by the uncertainty principle. This setup thus represents a promising route for performing efficient large-gain qubit measurement that is completely on-chip, and that does not rely on the use of circulators or complex non-reciprocal amplifiers. |
| first_indexed | 2024-03-12T16:49:36Z |
| format | Article |
| id | doaj.art-66c185cbe0db44979076e7b7685ea1d7 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:49:36Z |
| publishDate | 2014-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-66c185cbe0db44979076e7b7685ea1d72023-08-08T11:23:51ZengIOP PublishingNew Journal of Physics1367-26302014-01-01161111303210.1088/1367-2630/16/11/113032Large gain quantum-limited qubit measurement using a two-mode nonlinear cavityS Khan0R Vijay1I Siddiqi2A A Clerk3Department of Physics, McGill University , Montreal, H3A 2T8, CanadaTata Institute of Fundamental Research , Mumbai 400005, IndiaDepartment of Physics, University of California , Berkeley, CA 94720, USADepartment of Physics, McGill University , Montreal, H3A 2T8, CanadaWe provide a thorough theoretical analysis of qubit state measurement in a setup where a driven, parametrically-coupled cavity system is directly coupled to the qubit, with one of the cavities having a weak Kerr nonlinearity. Such a system could be readily realized using circuit QED architectures. We demonstrate that this setup is capable in the standard linear-response regime of both producing a highly amplified output signal while at the same time achieving near quantum-limited performance: the measurement backaction on the qubit is near the minimal amount required by the uncertainty principle. This setup thus represents a promising route for performing efficient large-gain qubit measurement that is completely on-chip, and that does not rely on the use of circulators or complex non-reciprocal amplifiers.https://doi.org/10.1088/1367-2630/16/11/113032quantum amplifiersuperconducting circuitsqubit measurementquantum noise |
| spellingShingle | S Khan R Vijay I Siddiqi A A Clerk Large gain quantum-limited qubit measurement using a two-mode nonlinear cavity New Journal of Physics quantum amplifier superconducting circuits qubit measurement quantum noise |
| title | Large gain quantum-limited qubit measurement using a two-mode nonlinear cavity |
| title_full | Large gain quantum-limited qubit measurement using a two-mode nonlinear cavity |
| title_fullStr | Large gain quantum-limited qubit measurement using a two-mode nonlinear cavity |
| title_full_unstemmed | Large gain quantum-limited qubit measurement using a two-mode nonlinear cavity |
| title_short | Large gain quantum-limited qubit measurement using a two-mode nonlinear cavity |
| title_sort | large gain quantum limited qubit measurement using a two mode nonlinear cavity |
| topic | quantum amplifier superconducting circuits qubit measurement quantum noise |
| url | https://doi.org/10.1088/1367-2630/16/11/113032 |
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