A Compact TIA in 22nm FDSOI CMOS for Qubit Readout in Monolithic Quantum Processors

TL;DR

This paper presents a highly compact, inductorless transimpedance amplifier in 22nm FDSOI CMOS, optimized for spin qubit readout in monolithic quantum processors, achieving high gain, broad bandwidth, and minimal size.

Contribution

It introduces a novel, ultra-compact inductorless TIA in 22nm FDSOI CMOS, suitable for integration in quantum processors, with significantly reduced size compared to prior designs.

Findings

Achieves 103 dBΩ transimpedance gain and 13 GHz bandwidth at room temperature.

Core area is approximately 0.00025 mm², about two orders of magnitude smaller than previous works.

Expected to perform slightly better at cryogenic temperatures.

Abstract

This paper reports an inductorless transimpedance amplifier (TIA) with very compact size and adequate performance for spin qubit readout operations in monolithic quantum processors. The TIA has been designed and fabricated in a 22nm FDSOI CMOS foundry technology commercially available. The measurement results show a transimpedance gain of 103 dB{\Omega} with a bandwidth of 13 GHz, at room temperature, and it is expected to exhibit slightly superior performance at cryogenic temperatures. The power consumption amounts to 4.1 mW. The core area amount to 0.00025 mm2, i.e., about two orders of magnitude smaller with respect to the prior-art works, and approaching the qubit size, which makes the inductorless TIA a compact enabling solution for monolithic quantum processors.