title: Note: cryogenic coaxial microwave filters.
abstract: The careful filtering of microwave electromagnetic radiation is critical for controlling the electromagnetic environment for experiments in solid-state quantum information processing and quantum metrology at millikelvin temperatures. We describe the design and fabrication of a coaxial filter assembly and demonstrate that its performance is in excellent agreement with theoretical modelling. We further perform an indicative test of the operation of the filters by making current-voltage measurements of small, underdamped Josephson junctions at 15 mK.
authors.affiliation: Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, United Kingdom.
authors.forename: G
authors.initials: G
authors.lastname: Tancredi
authors.affiliation: Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Schmidlin
authors.affiliation: Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, United Kingdom.
authors.forename: P J
authors.initials: PJ
authors.lastname: Meeson