CEA-Leti, in collaboration with Quobly, CEA-List, and CEA-Irig, has unveiled a cryo-CMOS charge-readout IC capable of simultaneous microsecond readouts for multiple qubits, achieving a record-low power consumption of 18.5μW per qubit. Presented at ISSCC 2025, the solution leverages FD-SOI CMOS technology and a capacitive-feedback transimpedance amplifier (CTIA) to enable 4- and 16-point quadrature-amplitude modulation (QAM), significantly reducing power use by 10x and footprint by 2x compared to existing methods.
The innovation addresses key scalability challenges in quantum computing, such as wiring bottlenecks and cryogenic power constraints. Quentin Schmidt, lead author of the paper, noted, “This approach allows for efficient multiplexing of qubits, paving the way for scalable quantum integrated circuits.” Franck Badets, research director at CEA-Leti, added, “The use of QAM for qubit readout marks a significant improvement over traditional frequency-division multiplexing, offering a more compact and power-efficient solution.”
Quobly, a leader in silicon-based quantum computing, highlighted the integration of classical cryo-CMOS electronics with quantum systems as a critical step toward scalable quantum processors. Tristan Meunier, Quobly’s chief scientist, stated, “This work demonstrates the feasibility of co-integrating control and readout functions on-chip, a milestone in our roadmap for fault-tolerant quantum computing.”
For more details, visit the CEA-Leti’s press release here.
February 20, 2025
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