Qubit

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A 19.4-fsRMS Jitter 0.1-to-44-GHz Cryo-CMOS Fractional-N CP-PLL Featuring Automatic Bleed Calibration for Quantum Computing

A 19.4-fsRMS Jitter 0.1-to-44-GHz Cryo-CMOS Fractional-N CP-PLL Featuring Automatic Bleed Calibration for Quantum Computing 150 150
Author(s): Jinhai Xiao, Yong Chen, Ningyi Zhang, Xiaolong Liu, Rui Liu, Junao Zhu, Chenghao Zhang, Peng Luo, Maliang Liu, Yintang Yang, Xiaohua Ma, Yue Hao

Abstract:

Cryogenic fractional- $N$ phase-locked loops (PLLs) are essential for large-scale superconducting quantum computing, and serve as integrated pump sources for Josephson parametric amplifiers. These PLLs enable high-fidelity qubit readout while reducing the thermal load and wiring complexity associated with room-temperature generators. However, the cryogenic pump sources developed thus far were …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 19
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3653994
Publisher: IEEE

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A Cryo-BiCMOS Controller for Quantum Computers based on Trapped Beryllium Ions

A Cryo-BiCMOS Controller for Quantum Computers based on Trapped Beryllium Ions 150 150
Author(s): Peter Toth, Paul Shine Eugine, Yerzhan Kudabay, Kaoru Yamashita, Sebastian Halama, Judi Parvizinejad, Marco Bonkowski, Hiroki Ishikuro, Christian Ospelkaus, Vadim Issakov

Abstract:

This article presents a cryo-BiCMOS system on chip (SoC) designed for single and two-qubit gate operations for quantum computers (QCs) based on beryllium trapped-ions (TIs). Signal generation from 0.7 to 1.6 GHz is supported, covering all microwave transitions in a ${}^{9}\text {Be}^{+}$ QC realization. An integrated 48-kbit waveform memory is implemented for …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 673 – 689
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2025.3632204
Publisher: IEEE

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