Ultralow-power coherent qubit control using AQFP logic at millikelvin temperatures
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arXiv
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| Format: | Preprint |
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2026
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| author | Mukai, Hiroto Tomonaga, Akiyoshi Wang, Rui Zhou, Yu Yamashita, Taro Yoshikawa, Nobuyuki Tsai, Jaw-Shen Takeuchi, Naoki |
| author_facet | Mukai, Hiroto Tomonaga, Akiyoshi Wang, Rui Zhou, Yu Yamashita, Taro Yoshikawa, Nobuyuki Tsai, Jaw-Shen Takeuchi, Naoki |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_27231 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultralow-power coherent qubit control using AQFP logic at millikelvin temperatures Mukai, Hiroto Tomonaga, Akiyoshi Wang, Rui Zhou, Yu Yamashita, Taro Yoshikawa, Nobuyuki Tsai, Jaw-Shen Takeuchi, Naoki Quantum Physics 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. |
| title | Ultralow-power coherent qubit control using AQFP logic at millikelvin temperatures |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.27231 |