RESISTIVE FLEX ATTENUATOR FOR A QUBIT ENVIRONMENT

A resistive flex microwave attenuator for coupling control signals to a quantum computational hardware system includes a set of planar transmission lines, each such planar transmission line having first and second ends along a longitudinal axis. Each such planar transmission line includes: a set of ground planes disposed in a direction parallel to the longitudinal axis; a dielectric disposed in a direction parallel to the longitudinal axis and in contact with the set of ground planes; a signal line disposed in a direction parallel to the longitudinal axis and in contact with the set of ground planes; a metallic layer disposed around the set of ground planes; an input, coupled to such planar transmission line at the first end, and configured to receive the control signals; and an output, coupled to such planar transmission line at the second end, and configured for coupling to the quantum computational hardware system. At least one member selected from the group consisting of a ground plane of the set of ground planes and the signal line is resistive to provide attenuation. The set of planar transmission lines has a geometry configured for dissipation of heat, attributable to energy provided at the input, in a manner distributed along a length of the set of planar transmission lines. The set of planar transmission lines provide attenuation, without recourse to discrete components, across a desired frequency band. If there are a plurality of planar transmission lines, the set of planar transmission lines is disposed so that their respective ground planes are approximately coincident Un atténuateur résistif flex à microondes destiné à coupler des signaux de commande à un système quantique computationnel matériel comprend un ensemble de lignes de transmission planaires, chacune de ces lignes de transmission planaires présentant des premières et des secondes extrémités sur un axe longitudinal. Chacune de ces lignes de transmission planaires comprend : un ensemble de plans de masse disposé dans un sens parallèle à l'axe longitudinal; un diélectrique disposé dans un sens parallèle à l'axe longitudinal et en contact avec l'ensemble de plans de masse; une ligne de signaux disposée dans un sens parallèle à l'axe longitudinal et en contact avec l'ensemble de plans de masse; une couche métallique disposée autour de l'ensemble de plans de masse; une entrée, couplée à cette ligne de transmission planaire au niveau de la première extrémité, configurée pour recevoir les s