基于射频电容栅极的感测
Radio-frequency capacitive gate-based sensing
摘要：
发展快速、准确和可扩展的量子态读出技术是基于光子晶体的量子计算的一个活跃领域。在这里，我们提出的硅角态量子点耦合到集总元件电谐振器通过栅极的色散传感的结果。量子器件的栅极电容被配置为与超导螺旋电感器并联，从而产生具有400-800范围内的加载Q因子的谐振器。对于工作在330 MHz的谐振器，我们实现了7.7 $μ$ e $/\sqrt{\text{Hz}}$的电荷灵敏度，并且当工作在616 MHz时，我们得到1.3 $μ$ e $/\sqrt{\text{Hz}}$。我们进行的谐振器的参数研究，以揭示其最佳的工作点，并进行电路分析，以确定最佳的谐振器设计。结果将基于栅极的感测与最佳报道的射频单电子晶体管灵敏度相提并论，同时为量子态读出提供了快速且紧凑的方法。
英文摘要：
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 $μ$e$/\sqrt{\text{Hz}}$ and, when operating at 616 MHz, we get 1.3 $μ$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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