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Applied Optics and Photonics China (AOPC)

Sensitivity enhancement in Rydberg atomic microwave superheterodyne measurements through laser-atom-microwave interaction mechanisms

Zhongzhou Tian, Guojin Zeng, Chao Yan, Yan‐Qiang Ji, Xuezhou Yang, Xiaoli Gao

Published Oct 28, 2025• 0 citations
Publisher

Abstract

Measurement sensitivity is crucial for the practical application of Rydberg atomic microwave superheterodyne receiver systems in communication, radar, and navigation. Based on laser-atom-microwave interaction mechanisms, the influence of laser powers and local-oscillator (LO) microwave field intensity on measurement sensitivity is systematically studied in this paper. Measurement sensitivity is analyzed through electromagnetically induced transparency (EIT) spectral characteristics, specifically EIT amplitude and full-width-half-maximum (FWHM),larger amplitudes and narrower FWHM indicate improved signal-to-noise ratios. For a 60D-state Rydberg atomic system with fixed probe and coupling laser beam waists (800 µm and 875 µm), optimal parameters are determined: probe laser power of 60 µW(Rabi frequency: 2π×7.02 MHz), coupling laser power of 40 mW (Rabi frequency: 2π×0.66 MHz), and LO microwave Rabi frequency of 2π×8.34 MHz. Experimental results demonstrate a 4.6 dB sensitivity enhancement, advancing from −137.5dBm/Hz to −142.1 dBm/Hz at 3.21 GHz microwave field. This improvement is attributed to precise alignment of laser-atom and microwave-atom interactions, bridging the gap toward quantum sensitivity limits.

DOI
10.1117/12.3083579

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Measurement sensitivity is crucial for the practical application of Rydberg atomic microwave superheterodyne receiver systems in communication, radar, and navigation. Based on laser-atom-microwave interaction mechanisms, the influence of laser powers and local-oscillator (LO) microwave field intensity on measurement sensitivity is systematically studied in this paper. Measurement sensitivity is analyzed through electromagnetically induced transparency (EIT) spectral characteristics, specifically EIT amplitude and full-width-half-maximum (FWHM),larger amplitudes and narrower FWHM indicate improved signal-to-noise ratios. For a 60D-state Rydberg atomic system with fixed probe and coupling laser beam waists (800 µm and 875 µm), optimal parameters are determined: probe laser power of 60 µW(Rabi frequency: 2π×7.02 MHz), coupling laser power of 40 mW (Rabi frequency: 2π×0.66 MHz), and LO microwave Rabi frequency of 2π×8.34 MHz. Experimental results demonstrate a 4.6 dB sensitivity enhancement, advancing from −137.5dBm/Hz to −142.1 dBm/Hz at 3.21 GHz microwave field. This improvement is attributed to precise alignment of laser-atom and microwave-atom interactions, bridging the gap toward quantum sensitivity limits.
High-sensitivity measurements of the microwave electric field are important in applications of communication and metrology. The sensitivity of traditional Rydberg superheterodyne receivers in free space is effectively determined by the signal-to-noise ratio (SNR), which is often considered equivalent to sensitivity in practical sensing applications. In this work, we demonstrate a cavity-enhanced receiver, where an optical cavity significantly amplifies the interaction between the probe light and cesium atoms, which substantially improves the signal-to-noise ratio via enhancing the expansion coefficient κ . Here, κ is the edge slope of the single peak obtained by fitting the double-peak EIT-AT spectrum, characterizing the response of the probe light to the frequency detuning of the coupling laser. The sensitivity is thus boosted by a factor of approximately 19 dB. This study highlights the pivotal role of optical cavities in advancing Rydberg-based detection systems, offering a promising approach for high-sensitivity microwave electric field measurements.
A highly excited Rydberg atom via electromagnetically induced transparency with two color cascading lasers has extreme sensitivity to electric fields of microwave ranging from 100 MHz to over 1 THz. It can be used as susceptible atom-based microwave communication antennas where the carrier wave usually works exactly resonant to the transition between a pair of adjacent Rydberg states with large electric dipole moment. A technique of superheterodyne with a strong on-resonant local microwave oscillator is employed to induce considerable Autler-Townes splitting where the antennas has a highest dynamic response to another weak target signal microwave carrier. To further improve the sensitivity of atomic antenna in communication, we detune the carrier microwave frequency off resonance forming an asymmetrically optical splitting and fix the coupling laser frequency at the shoulder of the stronger one, and optimize the local field strength simultaneously. It gives a sensitivity of 12.50(04) nVcm−1⋅Hz−1/2\rm{nVcm^{-1}\cdot Hz^{-1/2}}nVcm−1⋅Hz−1/2. Its enhancement mechanism of sensitivity is also proved by a theoretical simulation.
Improving the bandwidth of Rydberg atom-based receivers is an ongoing challenge because of the long-lived Rydberg state lifetimes that limit the refresh rate of ground-state atoms. In particular, the local oscillator (LO)-based Rydberg mixer approach allows for bandwidths in a few MHz ranges. Here, we use the laser parameters of the Rydberg atomic receiver superheterodyne detection technology to study their respective bandwidths. We have confirmed through experiments that laser power and waist diameter can affect the Rabi frequency and thus alter the instantaneous bandwidth. The experimental results indicate that the instantaneous bandwidth is directly proportional to the Rabi frequency of the coupled light and inversely proportional to the Rabi frequency of the probe light. Optimal parameters for quantum sensing applications are identified through powerdependent Rabi oscillation measurements.
The atomic-vapor cell is a vital component for Rydberg atomic microwave sensors, and impacts on overall capability of Rydberg sensor. However, the conventional analysis approach on effect of vapor-cell length contains two implicit assumptions, that is, the same atomic population density and buffer gas pressure, which make it unable to accurately capture actual response about effect of Rydberg-atom-based sensor performance on different Rydberg atom population. Here, utilizing a stepped cesium atomic-vapor cell with five different dimensions at the same atomic population density and buffer gas pressure, the height and full width at half maximum of Electromagnetically Induced Transparency(EIT) signal, and the sensitivity of the atomic superheterodyne sensor are comprehensively investigated at the same Rabi frequences(saturated laser power) conditions. It is identified that EIT signal height is proportional to the cell length, full width at half maximum and sensitivity grow with the increment of cell length to a certain extent. Based on the coherent integration signal theory and atomic linear expansion coefficient method, theoretical analysis of the EIT height and sensitivity are further investigated. The results could shed new light on the understanding and design of ultrahigh-sensitivity Rydberg atomic microwave sensors and find promising applications in quantum measurement, communication, and imaging.
The atomic-vapor cell is a vital component for Rydberg atomic microwave sensors, and impacts on overall capability of Rydberg sensors. However, the conventional analysis approach on effect of vapor-cell length contains two implicit assumptions, that is, the same atomic population density and buffer gas pressure, which make it unable to accurately capture actual response about effect of Rydberg-atom-based sensor performance on different Rydberg atom populations. Here, utilizing a stepped cesium atomic-vapor cell with five different dimensions at the same atomic population density and buffer gas pressure, the height and full width at half maximum of electromagnetically induced transparency (EIT) signal, and the sensitivity of the atomic superheterodyne sensor are comprehensively investigated under conditions of the same Rabi frequencies (saturated laser power). It is identified that EIT signal height is proportional to the cell length, full width at half maximum and sensitivity grow with the increment of cell length to a certain extent. Employing the coherent integration signal theory and atomic linear expansion coefficient method, theoretical analysis of the EIT height and sensitivity are further investigated. The results could shed new light on understanding and design of ultrahigh-sensitivity Rydberg atomic microwave sensors and find promising applications in quantum measurement, communication, and imaging.
In the field of Instrumentation & Measurement (I&M), overcoming the inherent trade-off between instantaneous bandwidth and sensitivity in Rydberg atom-based microwave electrometry remains a significant challenge. We propose a novel method of co-optimizing the Rabi frequencies of dual microwave fields (LO and SIG). This enables simultaneous enhancement of instantaneous bandwidth and sensitivity in a Rydberg-based receiver. In experimental settings, the significant power disparity between heterodyne fields typically necessitates an increase in the power of the local oscillator (LO) field. Conventional measurement techniques under such high power differentials can induce high-order harmonics—a phenomenon associated with the Floquet effect—resulting in deviations from resonant behavior and an increase in noise. This, in turn, reduces the atomic population distribution and constrains the system bandwidth. Leveraging the sensitivity enhancement mechanisms provided by electromagnetically induced transparency (EIT) and Autler–Townes (AT) splitting, we experimentally characterized the relationship between the Rabi frequencies of the LO and the target signal (SIG) microwave fields. Our approach enables the optimization and fine-tuning of parameters of the auxiliary microwave field to mitigate performance degradation caused by these nonlinear effects, thereby extending the frequency response of the system beyond the limitations of conventional resonance-based methods. As a result, our team has achieved an instantaneous bandwidth of 7.1 MHz coupled with a sensitivity of 51nV cm−1Hz−1/2under a -41 dBm power difference condition. This work establishes a new instrumentation framework for high-dynamic-range sensing, directly addressing I&M limitations in nonlinear artifact suppression.