Direct spectrum analysis using a threshold detector with application to a superconducting circuit
We introduce a new and quantitative theoretical framework for noise spectral analysis using a threshold detector, which is then applied to a superconducting device: the Josephson bifurcation amplifier. We show that this new framework provides direct access to the environmental noise spectrum with a...
| 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/10.1088/1367-2630/16/5/055010 |
| _version_ | 1797751452795404288 |
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| author | G Ithier G Tancredi P J Meeson |
| author_facet | G Ithier G Tancredi P J Meeson |
| author_sort | G Ithier |
| collection | DOAJ |
| description | We introduce a new and quantitative theoretical framework for noise spectral analysis using a threshold detector, which is then applied to a superconducting device: the Josephson bifurcation amplifier. We show that this new framework provides direct access to the environmental noise spectrum with a sensitivity approaching the standard quantum limit of weak continuous measurements. In addition, the accessible frequency range of the spectrum is, in principle, limited only by the ring down time of the resonant mode. This on-chip noise detector is non-dissipative and works with low probing powers, allowing it to be operated at low temperatures ( $T<15$ mK). We exploit this technique for measuring the frequency fluctuations of our device and find a low frequency noise with an amplitude and spectrum compatible with a dielectric origin. |
| first_indexed | 2024-03-12T16:49:45Z |
| format | Article |
| id | doaj.art-9031b64cfa77404c8c4ccb9058c7efbc |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:49:45Z |
| publishDate | 2014-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-9031b64cfa77404c8c4ccb9058c7efbc2023-08-08T11:25:23ZengIOP PublishingNew Journal of Physics1367-26302014-01-0116505501010.1088/1367-2630/16/5/055010Direct spectrum analysis using a threshold detector with application to a superconducting circuitG Ithier0G Tancredi1P J Meeson2Department of Physics , Royal Holloway, University of London, UKDepartment of Physics , Royal Holloway, University of London, UKDepartment of Physics , Royal Holloway, University of London, UKWe introduce a new and quantitative theoretical framework for noise spectral analysis using a threshold detector, which is then applied to a superconducting device: the Josephson bifurcation amplifier. We show that this new framework provides direct access to the environmental noise spectrum with a sensitivity approaching the standard quantum limit of weak continuous measurements. In addition, the accessible frequency range of the spectrum is, in principle, limited only by the ring down time of the resonant mode. This on-chip noise detector is non-dissipative and works with low probing powers, allowing it to be operated at low temperatures ( $T<15$ mK). We exploit this technique for measuring the frequency fluctuations of our device and find a low frequency noise with an amplitude and spectrum compatible with a dielectric origin.https://doi.org/10.1088/1367-2630/16/5/055010Josephson bifurcation amplifierspectrum analysisthreshold detector85.25C.p |
| spellingShingle | G Ithier G Tancredi P J Meeson Direct spectrum analysis using a threshold detector with application to a superconducting circuit New Journal of Physics Josephson bifurcation amplifier spectrum analysis threshold detector 85.25C.p |
| title | Direct spectrum analysis using a threshold detector with application to a superconducting circuit |
| title_full | Direct spectrum analysis using a threshold detector with application to a superconducting circuit |
| title_fullStr | Direct spectrum analysis using a threshold detector with application to a superconducting circuit |
| title_full_unstemmed | Direct spectrum analysis using a threshold detector with application to a superconducting circuit |
| title_short | Direct spectrum analysis using a threshold detector with application to a superconducting circuit |
| title_sort | direct spectrum analysis using a threshold detector with application to a superconducting circuit |
| topic | Josephson bifurcation amplifier spectrum analysis threshold detector 85.25C.p |
| url | https://doi.org/10.1088/1367-2630/16/5/055010 |
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