The significant progress of quantum sensing technologies offer numerous radical solutions for measuring a multitude of physical quantities at an unprecedented precision. Among them, Rydberg atomic quantum receivers (RAQRs) emerge as an eminent solution for detecting the electric field of radio frequency (RF) signals, exhibiting great potential in assisting classical wireless communications and sensing. So far, most experimental studies have aimed for the proof of physical concepts to reveal its promise, while the practical signal model of RAQR-aided wireless communications and sensing remained under-explored. Furthermore, the performance of RAQR-based wireless receivers and their advantages over classical RF receivers have not been fully characterized. To fill these gaps, we introduce the RAQR to the wireless community by presenting an end-to-end reception scheme. We then develop a corresponding equivalent baseband signal model relying on a realistic reception flow. Our scheme and model provide explicit design guidance to RAQR-aided wireless systems. We next study the performance of RAQR-aided wireless systems based on our model, and compare them to classical RF receivers. The results show that Doppler broadening-free RAQRs are capable of achieving a substantial received signal-to-noise ratio (SNR) gain of over $27$ decibel (dB) and $40$ dB in the photon shot limit and standard quantum limit regimes, respectively.

翻译：量子传感技术的重大进展为以空前精度测量多种物理量提供了众多革命性解决方案。其中，里德堡原子量子接收器（RAQR）作为检测射频信号电场的杰出解决方案脱颖而出，在辅助经典无线通信与感知方面展现出巨大潜力。迄今为止，大多数实验研究聚焦于物理概念的验证以揭示其前景，而RAQR辅助无线通信与感知的实际信号模型仍待深入探索。此外，基于RAQR的无线接收器性能及其相较于经典射频接收器的优势尚未得到充分表征。为填补这些空白，本文通过提出端到端接收方案将RAQR引入无线通信领域。随后，我们基于实际接收流程建立了相应的等效基带信号模型。我们的方案与模型为RAQR辅助无线系统提供了明确的设计指导。基于该模型，我们进一步研究了RAQR辅助无线系统的性能，并与经典射频接收器进行对比。结果表明，在光子散粒噪声极限与标准量子极限条件下，无多普勒展宽的RAQR分别能实现超过$27$分贝（dB）和$40$ dB的显著接收信噪比增益。