Characterizing the attenuation of coaxial and rectangular microwave-frequency waveguides at cryogenic temperaturesPhilipp Kurpiers, Theodore Walter, Paul Magnard, Yves Salathe and Andreas WallraffEPJ Quantum Technol., 4 1 (2017) 8DOI: https://doi.org/10.1140/epjqt/s40507-017-0059-7