高频探测器模式辅助的量子比特系综快速读出增强缩放
Scaling-Enhanced Rapid Readout of a Qubit Ensemble Assisted by High-Frequency Detector Modes
- The University of Tokyo（东京大学）
- RIKEN Center for Quantum Computing (RQC)（理化学研究所量子计算中心）
- Chuo University（中央大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文研究量子比特系综集体读出时间随量子比特数的缩放，提出高频探测器模式可超越基准$N^{-1/2}$，实现$N^{-1/(2-\ u)}$的缩放优势，光谱结构控制缩放指数。
AI中文摘要：
大型量子比特系综的量子测量通常通过将系综耦合到探测器并随后测量探测器来间接进行。尽管快速集体读出非常重要，但尚不清楚读出时间如何随量子比特数$N$缩放。在这里，我们首先为没有紫外高频模式的一类广泛探测器建立了$N^{-1/2}$的基准。然后我们证明，具有无界高频模式的探测器可以超越这一基准，并在$0 < \ u < 2$时产生特征时间缩放$N^{-1/(2-\ u)}$，其中$\ u$表征探测器的光谱结构。我们的结果确立了高频探测器模式作为实现集体量子读出缩放优势的资源，探测器光谱直接控制读出时间的缩放指数。
英文摘要：
Quantum measurements of large qubit ensembles are often performed indirectly by coupling the ensemble to a detector and subsequently measuring the detector. Despite the importance of rapid collective readout, it remains unclear what determines how the readout time scales with the number of qubits $N$. Here, we first establish a benchmark $N^{-1/2}$ for a broad class of detectors without ultraviolet high-frequency modes. We then show that the detector with unbounded high-frequency modes can surpass this benchmark and yield a characteristic time scaling $N^{-1/(2-ν)}$ for $0 < ν< 2$, where $ν$ characterizes the spectral structure of the detector. Our results establish high-frequency detector modes as a resource for achieving a scaling advantage in collective quantum readout, with the detector spectrum directly controlling the scaling exponent of the readout time.
