A Cryogenic High Voltage Analog Switch for Trapped Ion Quantum Computers

The challenge for trapped ion quantum computers (TIQC) is scaling the system with its large number of IOs. Analog multiplexers operated near the trap are essential to enable large-scale TIQC. This paper presents an analog switch that can be used as a building block for the required analog multiplexers. The switching cell operates down to a temperature of 4 K. It can block an input voltage of 20 V (±10 V). At 77 K, the switch has an on-resistance of around 300 Ω. It consumes 39 µW in the closed state and 19.5 µW in the open state. Although the switch operates down to 4 K, the carrier freeze-out in the drift region causes non-linearity in the switch’s on-resistance.