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~$μ$W the measured voltage and current noise level is 0.6~nV/$\sqrt{Hz}$ and below 1.5~fA/$\sqrt{Hz}$, 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.
A Sub-electron-noise Skipper-CCD Readout ASIC with Improved Channel-to-channel Isolation and an Integrated Cryogenic Voltage Reference
Instituto Balseiro（巴尔塞罗研究所）；Instituto de Nanociencia y Nanotecnología INN (CNEA-CONICET)（纳米科学与技术研究所（CNEA-CONICET））；Fermi National Accelerator Laboratory（费米国家加速器实验室）；Universidad Nacional de Córdoba（科尔多瓦国立大学）；Comisión Nacional de Energía Atómica (CNEA)（国家原子能委员会）；CONICET（阿根廷国家科学研究委员会）
