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Electromagnetic noise is one of the key external factors decreasingsuperconducting qubits coherence. Matched coaxial filters can prevent microwaveand IR photons negative influence on superconducting quantum circuits. Here, wereport on design and fabrication route of matched low-pass coaxial filters fornoise-sensitive measurements at milliKelvin temperatures. A robust transmissioncoefficient with designed linear absorption (-1dB/GHz) and ultralow reflectionlosses less than -20 dB up to 20 GHz is achieved. We present a mathematicalmodel for evaluating and predicting filters transmission parameters dependingon their dimensions. It is experimentally approved on two filters prototypesdifferent lengths with compound of Cu powder and Stycast commercial resindemonstrating excellent matching. The presented design and assembly route areuniversal for various compounds and provide high repeatability of geometricaland microwave characteristics. Finally, we demonstrate three filters withalmost equal reflection and transmission characteristics in the range from 0 to20 GHz, which is quite useful to control multiple channel superconductingquantum circuits.

Robust cryogenic matched low-pass coaxial filters for quantum computing applications