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IEEE Transactions on Antennas and Propagation

Response Analysis of Four-Level Heterodyne Rydberg Atom Receiver

Yu Tang, Siyuan Wang, Shuang Ren, Chenguang Yang, Hanbin Zhou, Chenxi Lu

Published Jan 22, 2026• 3 citations
Publisher
DOI
10.1109/tap.2026.3654006

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The four-level heterodyne Rydberg atom receiver has garnered significant attention in microwave detection and communication due to its high sensitivity and phase measurement capabilities. Existing theoretical studies, primarily based on static solutions, are limited in characterizing the system's frequency response. To address this, this paper comprehensively investigates the dynamic solutions of the density matrix elements for the four-level heterodyne structure, establishing a quantitative relationship between system response, signal frequency, and system parameters. This enables theoretical bandwidth calculations and performance analysis. This paper also constructs a noise model for the density matrix elements, revealing the relationship between the ultimate sensitivity of the Rydberg atom receiver and the noise in the density matrix elements. Both theoretical simulation and experimental results demonstrate that the bandwidth of the four-level heterodyne receiver can exceed 10 MHz. This study provides critical theoretical support for the engineering applications and performance optimization of heterodyne Rydberg atom receivers.
In recent years, quantum reception technology has achieved significant progress in microwave detection. However, most existing studies focus on energy-level resonance conditions, while research on the influence of frequency detuning is relatively scarce. Based on the four-level heterodyne Rydberg-atom receiver system, this paper establishes a theoretical model using the two-dimensional Fourier transform to analyze the correlation between frequency detuning and system response. Through theoretical simulation, the system response under different detuning conditions is quantitatively obtained, and the model is verified by experiment. This study expands the understanding of frequency detuning in Rydberg-atom receivers and provides guidance for designing their parameters in complex environments.
Rydberg atom can respond to weak microwave electric field signal in real-time by using its electromagnetically induced transparency effect to realize down conversion of space microwave electric field signal, which can be used as a superheterodyne receiver. The Rydberg atom superheterodyne receiver is a new receiving system composed of Rydberg atoms, photodetectors, and electronic information processing modules. Presently, the physical response mechanism of Rydberg atomic superheterodyne receiving technology is studied in depth. However, no complete receiving link analysis model has been established, which is not conducive to optimizing its system performance. Based on the physical mechanism of the Rydberg atom responding to the microwave electric field, this paper introduces the concept of intrinsic expansion coefficient, establishes and experimentally verifies the receiving link model of the Rydberg atom superheterodyne receiver, and briefly discusses the influence of the intrinsic expansion coefficient on the system sensitivity and response characteristics, thereby providing the theoretical guidance for optimizing the performance of the Rydberg atom superheterodyne receiving system. In the end, the Rydberg atomic and the electronic receiving links' sensitivity performance is discussed and compared.