Functional flexible cables for cryogenic quantum systems

The interconnection between cryogenic quantum chips and room temperature measurement and control systems is a critical issue for quantum computing. In this paper, integrated filtering cryogenic flexible cables are designed to suppress external noise for the transmission of weak and high-frequency signal between low temperature and room temperature. They are made of flexible substrate (PI or LCP) with good flexibility and high integration, and lower heat loss than typical cryogenic coaxial cables. The low-pass filter is integrated in the cable with changing the line width, and the high-frequency noise can be effectively suppressed.