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arXiv · 1906.10584

Fast charge sensing of Si/SiGe quantum dots via a high-frequency accumulation gate

Christian Volk·Anasua Chatterjee·Fabio Ansaloni·Charles M. Marcus·Ferdinand Kuemmeth
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Abstract

Quantum dot arrays are a versatile platform for the implementation of spin qubits, as high-bandwidth sensor dots can be integrated with single-, double- and triple-dot qubits yielding fast and high-fidelity qubit readout. However, for undoped silicon devices, reflectometry off sensor ohmics suffers from the finite resistivity of the two-dimensional electron gas (2DEG), and alternative readout methods are limited to measuring qubit capacitance, rather than qubit charge. By coupling a surface-mount resonant circuit to the plunger gate of a high-impedance sensor, we realized a fast charge sensing technique that is compatible with resistive 2DEGs. We demonstrate this by acquiring at high speed charge stability diagrams of double- and triple-dot arrays in Si/SiGe heterostructures as well as pulsed-gate single-shot charge and spin readout with integration times as low as 2.4 $\mu$s.

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Christian Volk, Anasua Chatterjee, Fabio Ansaloni, Charles M. Marcus, Ferdinand Kuemmeth. 2019-06-25. Fast charge sensing of Si/SiGe quantum dots via a high-frequency accumulation gate. https://doi.org/10.1021/acs.nanolett.9b02149

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