A 4.2mW 4K 6-8GHz CMOS LNA for Superconducting Qubit Readout

Alican Çaglar, Steven Van Winckel, Steven Brebels, Piet Wambacq, Jan Craninckx

Research output: Chapter in Book/Report/Conference proceedingConference paper

4 Citations (Scopus)


Millions of qubits need to be employed in a quantum computer to achieve a fault-tolerant quantum operation. To reduce the complexity in such a large-scale system, the control and readout circuitries have been proposed to be placed at the 4 K stage of dilution refrigerators [1]. CMOS technology is commonly used to leverage its scaling to enable large integration of control and readout circuitries with qubits. However, the high-fidelity readout operations require low noise amplifiers (LNAs) with a noise temperature of a few Kelvins. This necessitates the usage of HEMT and parametric amplifiers [2]. Recently reported CMOS LNAs are still far away from attaining such good performance [3-5]. Thus, this is one of the greatest challenges on the way to the fully integrated CMOS readout. Additionally, due to the limited cooling power of dilution refrigerators, low-power solutions are needed for achieving a very good noise performance at 4 K. This paper presents a 28 nm CMOS LNA for qubit readout, which achieves an order of magnitude power reduction compared to its CMOS counterparts while still providing a similar good noise Figure (NF) performance at 4 K.

Original languageEnglish
Title of host publicationProceedings of IEEE Asian Solid-State Circuits Conference (A-SSCC) 2021
Number of pages3
ISBN (Electronic)9781665443500
Publication statusPublished - 2021
EventAsian Solid-State Circuit Conference 2021 -
Duration: 7 Nov 202110 Nov 2021

Publication series

NameProceedings - A-SSCC 2021: IEEE Asian Solid-State Circuits Conference


ConferenceAsian Solid-State Circuit Conference 2021
Internet address


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