Marcel Kossel, Matthias Brandli, et al.
ESSERC 2024
An 8b digital-to-analog converter (DAC) based transmitter (TX) in 7 nm CMOS for cryogenic quantum applications is presented. It operates at up to 40GS/s using pushpull output stages with polysilicon resistors (peres) and employs an A/B weighting concept within the DAC output stages for area and clock load reduction. A 32 kB static random-access memory (SRAM) is included for direct radio frequency (RF) arbitrary waveform generation (AWG) as well as a sequencer state machine that performs replays with arbitrary sequence length. The DAC is tailored for integrated qubit control signal generation at the 4 K stage of a cryostat, and includes an external trigger to synchronize multiple DAC TXs. We demonstrate the operation of the circuitry, with a total area of 0.1 and efficiency of 3.2 pJ/b, down to a temperature of 4 K. The work represents one of the smallest footprint cryogenic controllers with on-chip memory realized to date.
Marcel Kossel, Matthias Brandli, et al.
ESSERC 2024
Elisa Bäumer, Vinay Tripathi, et al.
APS March Meeting 2024
Pauline J. Ollitrault, Abhinav Kandala, et al.
PRResearch
Petar Jurcevic, Luke Govia
APS March Meeting 2023