Investigating pin-holes issues in Josephson junction travelling waveparametric amplifiers requiring large area of dielectric layer
Microwave superconducting Josephson Travelling Wave Parametric Amplifiers (JTWPAs) exploit the non-linear inductance of a long superconducting metamaterial line formed by thousands of Josephson junctions to achieve broadband parametric gain with quantum limited added noise. Nevertheless, pin-holes i...
| Main Authors: | , , , , |
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| Format: | Conference item |
| Language: | English |
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2024
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| _version_ | 1826314852746919936 |
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| author | Navarro Montilla, J Klimovich, N Arnaud, B Driessen, EFC Tan, B-K |
| author_facet | Navarro Montilla, J Klimovich, N Arnaud, B Driessen, EFC Tan, B-K |
| author_sort | Navarro Montilla, J |
| collection | OXFORD |
| description | Microwave superconducting Josephson Travelling Wave Parametric Amplifiers (JTWPAs) exploit the non-linear inductance of a long superconducting metamaterial line formed by thousands of Josephson junctions to achieve broadband parametric gain with quantum limited added noise. Nevertheless, pin-holes in the dielectric (spacer) layer required for fabricating these superconducting transmission lines (STLs) represent a challenge for JTWPAs fabrication. In this paper, we explore two pin-holes mitigation techniques, which shown promising results with DC characterisation of a suite of test structures at cryogenic temperatures. When implemented for actual JTWPA designs with much longer length, they have shown to improve the fabrication yield albeit some pin-holes still seems to exist over the large wafer area. This indicates that further mitigation effort is required to completely eradicate the pin-holes issue for applications requiring large area of dielectric layer such as microwave JTWPAs. |
| first_indexed | 2024-09-25T04:18:34Z |
| format | Conference item |
| id | oxford-uuid:3a9b1d3d-e1db-4c00-ad0d-c435290d35f2 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-12-09T03:11:25Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | oxford-uuid:3a9b1d3d-e1db-4c00-ad0d-c435290d35f22024-10-15T14:44:57ZInvestigating pin-holes issues in Josephson junction travelling waveparametric amplifiers requiring large area of dielectric layerConference itemhttp://purl.org/coar/resource_type/c_5794uuid:3a9b1d3d-e1db-4c00-ad0d-c435290d35f2EnglishSymplectic Elements2024Navarro Montilla, JKlimovich, NArnaud, BDriessen, EFCTan, B-KMicrowave superconducting Josephson Travelling Wave Parametric Amplifiers (JTWPAs) exploit the non-linear inductance of a long superconducting metamaterial line formed by thousands of Josephson junctions to achieve broadband parametric gain with quantum limited added noise. Nevertheless, pin-holes in the dielectric (spacer) layer required for fabricating these superconducting transmission lines (STLs) represent a challenge for JTWPAs fabrication. In this paper, we explore two pin-holes mitigation techniques, which shown promising results with DC characterisation of a suite of test structures at cryogenic temperatures. When implemented for actual JTWPA designs with much longer length, they have shown to improve the fabrication yield albeit some pin-holes still seems to exist over the large wafer area. This indicates that further mitigation effort is required to completely eradicate the pin-holes issue for applications requiring large area of dielectric layer such as microwave JTWPAs. |
| spellingShingle | Navarro Montilla, J Klimovich, N Arnaud, B Driessen, EFC Tan, B-K Investigating pin-holes issues in Josephson junction travelling waveparametric amplifiers requiring large area of dielectric layer |
| title | Investigating pin-holes issues in Josephson junction travelling waveparametric amplifiers requiring large area of dielectric layer |
| title_full | Investigating pin-holes issues in Josephson junction travelling waveparametric amplifiers requiring large area of dielectric layer |
| title_fullStr | Investigating pin-holes issues in Josephson junction travelling waveparametric amplifiers requiring large area of dielectric layer |
| title_full_unstemmed | Investigating pin-holes issues in Josephson junction travelling waveparametric amplifiers requiring large area of dielectric layer |
| title_short | Investigating pin-holes issues in Josephson junction travelling waveparametric amplifiers requiring large area of dielectric layer |
| title_sort | investigating pin holes issues in josephson junction travelling waveparametric amplifiers requiring large area of dielectric layer |
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