Scaling-Enhanced Rapid Readout of a Qubit Ensemble Assisted by High-Frequency Detector Modes

Abstract: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 $N^{-1/(2-\nu)}$ for $0 < \nu < 2$, where $\nu$ 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.

arXiv:2609.08374 [quant-ph]

(or arXiv:2609.08374v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.08374 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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