Cryogenic Filters

The primary application of these filters is to block infrared radiation (undesired frequency range) between two stages of the cryostat, which is the containment enclosure of a quantum computer. Typically, there are five stages at different temperatures. Starting from the top and descending to the bottom stage, which approaches absolute zero (-273 °C), where the Qubits are located. These filters need to allow the RF signal to pass from one stage to another while preventing the propagation of infrared radiation. This is crucial for the proper functioning and extended lifespan of the Qubits.