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

Quantum Physics [Submitted on 28 Mar 2026] Ultralow-power coherent qubit control using AQFP logic at millikelvin temperatures Hiroto Mukai, Akiyoshi Tomonaga, Rui Wang, Yu Zhou, Taro Yamashita, Nobuyuki Yoshikawa, Jaw-Shen Tsai, 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. Comments: 11 pages, 5 figures Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.27231 [quant-ph]   (or arXiv:2603.27231v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2603.27231 Focus to learn more Submission history From: Naoki Takeuchi [view email] [v1] Sat, 28 Mar 2026 10:55:52 UTC (10,282 KB) Access Paper: view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-03 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)