CEA and Quobly Demonstrate 18.5μW/qubit Cryo-CMOS Readout with QAM Multiplexing for Spin Qubits

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 […]

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