Compact gate-based read-out of multiplexed quantum devices with a cryogenic CMOS active inductor

• URL: http://arxiv.org/abs/2102.04364v2
• Date: Tue, 9 Feb 2021 16:05:16 GMT
• Title: Compact gate-based read-out of multiplexed quantum devices with a cryogenic CMOS active inductor
• Authors: L. Le Guevel, G. Billiot, S. De Franceschi, A. Morel, X. Jehl, A.G.M. Jansen, G. Pillonnet
• Abstract summary: We report on a cryogenic circuit incorporating a CMOS-based active inductor. This type of circuit is especially conceived for the readout of semiconductor spin qubits.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In the strive for scalable quantum processors, significant effort is being devoted to the development of cryogenic classical hardware for the control and readout of a growing number of qubits. Here we report on a cryogenic circuit incorporating a CMOS-based active inductor enabling fast impedance measurements with a sensitivity of 10 aF and an input-referred noise of 3.7 aF/sqrt(Hz). This type of circuit is especially conceived for the readout of semiconductor spin qubits. As opposed to commonly used schemes based on dispersive rf reflectometry, which require mm-scale passive inductors, it allows for a markedly reduced footprint (50$\mu$m $\times$ 60$\mu$m), facilitating its integration in a scalable quantum-classical architecture. In addition, its active inductor results in a resonant circuit with tunable frequency and quality factor, enabling the optimization of readout sensitivity.

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