An electron-on-helium qubit is a promising physical platform for quantum information technologies. Among all the "blueprints" for the qubit realization, a hybrid Rydberg-spin qubit seems to be a promising one towards quantum computing using electron spins. The main technological challenge on the way to such qubits is a detection of fA range image current induced by Rydberg transition of a single electron. To address this problem we aim to use a tank LC-circuit in conjunction with a high impedance and low power dissipation cryogenic amplifier. Here, we report our progress towards realization of a resonant image current detector with a home-made cryogenic amplifier based on FHX13LG HEMT. We present a detailed characterization of the transistor at room and cryogenic temperatures, as well as details of the amplifier design and performance. At the power dissipation level of amplifier well below 100~μW the measured voltage and current noise level is 0.6~nV/Hz and below 1.5~fA/Hz, respectively. Based on the actual image current measurements of the Rydberg transition in a many-electron system on liquid helium, we estimate SNR=8 with the measurement bandwidth 1 Hz for the detection of a single-electron transition, providing the noise level at the output is solely determined by the noise of the amplifier.
@article{arxiv.2311.04437,
title = {Cryogenic resonant amplifier for electron-on-helium image charge readout},
author = {Mikhail Belianchikov and Jakob A. Kraus and Denis Konstantinov},
journal= {arXiv preprint arXiv:2311.04437},
year = {2023}
}