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Weak link nanobridges as single flux quantum elements

Shelly, C; See, P; Ireland, J; Roman, E J; Williams, J M (2017) Weak link nanobridges as single flux quantum elements. Supercond. Sci. Technol., 30 (9). 095013

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This paper investigates the feasibility of using weak link nanobridges as Josephson junction elements for the purpose of creating Josephson circuits. We demonstrate development of a single-layer electron-beam lithography procedure to fabricate niobium nanobridges with dimensions down to 40 nm × 100 nm.
The single-layer process facilitates fabrication that is calable to complex circuits that require many junctions. We measure the IV-characteristics of the nanobridges between temperatures of 4.2 and 9K and find agreement with numerical simulations and the analytical RSJ model. Furthermore, we investigate the behaviour of the nanobridges under microwave irradiation and observe the characteristic microwave-induced Shapiro steps. As a potential use of nanobridges in circuits requiring many junctions, we investigate the theoretical performance of a nanobridge-based Josephson comparator circuit using Josephson circuit simulator JSIM.

Item Type: Article
Subjects: Quantum Phenomena > Nanophysics
Divisions: Quantum Science
Identification number/DOI: 10.1088/1361-6668/aa80cd
Last Modified: 06 Feb 2018 10:15
URI: http://eprintspublications.npl.co.uk/id/eprint/7675

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