Cryogenic resonant amplifier for electron-on-helium image charge readout

• URL: http://arxiv.org/abs/2311.04437v1
• Date: Wed, 8 Nov 2023 03:14:39 GMT
• Title: Cryogenic resonant amplifier for electron-on-helium image charge readout
• Authors: Mikhail Belianchikov, Jakob A. Kraus, and Denis Konstantinov
• Abstract summary: A hybrid Rydberg-spin qubit seems to be a promising one towards quantum computing using electron spins. The main technological challenge is a detection of fA range image current induced by Rydberg transition of a single electron. Here, we report our progress towards realization of a resonant image current detector with a home-made cryogenic amplifier.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: 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~${\mu}$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.

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