Naoki Takeuchi

Ultralow-power coherent qubit control using AQFP logic at millikelvin temperatures

  1. Hiroto Mukai,
  2. Akiyoshi Tomonaga,
  3. Rui Wang,
  4. Yu Zhou,
  5. Taro Yamashita,
  6. Nobuyuki Yoshikawa,
  7. Jaw-Shen Tsai,
  8. and Naoki Takeuchi
Qubit controllers are essential for scaling superconducting quantum processors, but implementing them at the 10 mK stage of a dilution refrigerator remains challenging due to stringent
cooling constraints. Here we report an ultralow-power qubit controller using adiabatic quantum-flux-parametron (AQFP) logic, termed an AQFP-multiplexed qubit controller with virtual Z gates (AQFP QC-VZ). The AQFP QC-VZ generates multi-tone microwave pulses for qubit control with an ultralow power dissipation of 111 pW per qubit. By combining microwave and time-division multiplexing, the AQFP QC-VZ enables parallel application of X and virtual Z gates to multiple qubits using only a few control lines from room temperature. We demonstrate coherent single-qubit gates at the 10 mK stage using an AQFP mixer, a core component of the AQFP QC-VZ, without observable degradation in coherence.
arxiv pdf