Abstract
This paper presents miniature low-pass filters (LPF) using Integrated Passive Device technology for cryogenic quantum computing applications. These are crucial for providing a clean DC bias in qubit control and readout. Based on a 5th-order elliptic filter, we propose two LPF designs. One has a cascade topology (LPFI), and the other incorporates extra resistors (LPFII) to meet the rigorous broadband requirement for the targeted applications. At 4 K, LPFI and LPFII show measured insertion loss of 0.06 and 0.05 dB at 10 MHz, respectively. Also, both designs attain excellent high-frequency signal suppression better than ~ 30 dB up to 40 GHz. Compared with the commercial product using discrete devices for the same application, the proposed designs achieve comparable specifications with a reduced area of up to ~ 46.1%. Moreover, the proposed design has the advantage of fully integrated multi-channel scalability.