论文标题
由单光子射击噪声有限的腔室的电荷灵敏度
Charge sensitivity of a cavity-embedded Cooper pair transistor limited by single-photon shot noise
论文作者
论文摘要
使用操作员散射方法，我们分析了超敏电器的量子动力学 - 一个嵌入在四分之一波微波炉（CCPT）中的库珀对晶体管。尽管CCPT本质上是一种具有多种功能范围的可调，强烈的非线性系统，但我们将目前的分析限制为对其线性电荷感应能力的必要首次研究，限于与平均腔体光子数量$ \ \ lyssim 1 $相对应的低泵功率。假设可实现的CCPT参数（B. L. Brock等人，Phys。Phys。Applied，044009），并且不包括随后的放大器链中的噪声，我们预测基本的，光子射击噪声的电荷敏感性为$ 0.12 \，μ{\ Mathrm {\ Mathrm {e} $ {e}/\ sq y {泵浦腔平均有一个光子，CCPT接近电荷退化。将其与第一个报道的电荷灵敏度值$ 14 \，μ{\ mathrm {e}}/\ sqrt {\ Mathrm {hz}} $中的单个光制制度（B. L. Brock等人，Arxiv，Arxiv：2102.05362）。
Using an operator scattering approach, we analyze the quantum dynamics of an ultrasensitive electrometer -- a Cooper pair transistor embedded in a quarter-wave microwave cavity (cCPT). While the cCPT is inherently a tunable, strongly nonlinear system affording a diverse range of functionalities, we restrict our present analysis to a necessary first investigation of its linear charge sensing capabilities, limiting to low pump powers corresponding to an average cavity photon number $\lesssim 1$. Assuming realizable cCPT parameters (B. L. Brock et al., Phys. Rev. Applied, 044009), and not including noise from the subsequent amplifier chain, we predict the fundamental, photon shot noise-limited charge sensitivity to be $0.12\, μ{\mathrm{e}}/\sqrt{\mathrm{Hz}}$ when the pumped cavity has an average of one photon and the cCPT is operated close to charge degeneracy. This is to be compared with a first reported charge sensitivity value $14\, μ{\mathrm{e}}/\sqrt{\mathrm{Hz}}$ in the single-photon regime (B. L. Brock et al., arXiv:2102.05362).
