Conference item
Investigating pin-hole issues in Josephson junction travelling wave parametric amplifiers requiring large area of dielectric layer
- Abstract:
- 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.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
Actions
Access Document
- Files:
-
-
(Preview, Accepted manuscript, pdf, 6.1MB, Terms of use)
-
- Publication website:
- https://www.nrao.edu/meetings/isstt/2024.shtml
Authors
+ European Research Council
More from this funder
- Funder identifier:
- 803862
- Grant:
- https://ror.org/0472cxd90
- Programme:
- SPA4AstroQIT
+ Science and Technology Facilities Council
More from this funder
- Funder identifier:
- https://ror.org/057g20z61
- Grant:
- ST/Y004973/1
- Publisher:
- National Radio Astronomy Observatory
- Host title:
- ISSTT 2024 Proceedings
- Series:
- NRAO ISSTT Proceedings
- Publication date:
- 2025-05-16
- Acceptance date:
- 2024-07-25
- Event title:
- 33rd IEEE International Symposium on Space Terahertz Technology (ISSTT 2024)
- Event location:
- Charlottesville, Virginia, USA
- Event website:
- https://go.nrao.edu/ISSTT24
- Event start date:
- 2024-04-07
- Event end date:
- 2024-04-11
- Language:
-
English
- Keywords:
- Pubs id:
-
2018266
- Local pid:
-
pubs:2018266
- Deposit date:
-
2024-07-25
Terms of use
- Copyright date:
- 2025
- Notes:
-
This is the accepted manuscript version of the paper. The final version is forthcoming from the International Symposium on Space Terahertz Technology (ISSTT).
This research was funded in whole or in part by the Science and Technology Facility Council (ST/Y004973/1). For the purposes of Open Access, the author has applied a CC BY public copyright licence to any Author Accepted Manuscript (AAM) version arising from this submission.
- Licence:
- CC Attribution (CC BY)
If you are the owner of this record, you can report an update to it here: Report update to this record