Radio-frequency capacitive gate-based sensing

Abstract

Developing fast, accurate and scalable techniques for quantum state readout is an active area in semiconductor-based quantum computing. Here, we present results on dispersive sensing of silicon corner state quantum dots coupled to lumped-element electrical resonators via the gate. The gate capacitance of the quantum device is configured in parallel with a superconducting spiral inductor resulting in resonators with loaded Q-factors in the 400-800 range. For a resonator operating at 330 MHz, we achieve a charge sensitivity of 7.7 $\mu$e$/\sqrt{\text{Hz}}$ and, when operating at 616 MHz, we get 1.3 $\mu$e$/\sqrt{\text{Hz}}$. We perform a parametric study of the resonator to reveal its optimal operation points and perform a circuit analysis to determine the best resonator design. The results place gate-based sensing at par with the best reported radio-frequency single-electron transistor sensitivities while providing a fast and compact method for quantum state readout.

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Cited by in corpus (37)

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• Gate-based single-shot readout of spins in silicon
• Roadmap for gallium arsenide spin qubits
• Roadmap on quantum nanotechnologies
• Probing quantum devices with radio-frequency reflectometry
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• Single-shot single-gate RF spin readout in silicon
• A CMOS dynamic random access architecture for radio-frequency readout of quantum devices
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• Low-temperature tunable radio-frequency resonator for sensitive dispersive readout of nanoelectronic devices
• Dispersive readout of reconfigurable ambipolar quantum dots in a silicon-on-insulator nanowire
• Cryogenic hyperabrupt strontium titanate varactors for sensitive reflectometry of quantum dots
• Dispersive sensing in hybrid InAs/Al nanowires
• Non-reciprocal Pauli Spin Blockade in a Silicon Double Quantum Dot
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• Level anticrossing effect in single-level or multilevel double quantum dots: Electrical conductance, zero-frequency charge susceptibility and Seebeck coefficient
• Gate-Sensing Charge Pockets in the Semiconductor Qubit Environment
• Improved Single-Shot Qubit Readout Using Twin RF-SET Charge Correlations
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