We propose a Rydberg atom-based receiver for amplitude-modulation (AM) reception utilizing a dual-tone microwave field. The pseudo-random binary sequence (PRBS) signal is encoded in the basic microwave field (B-MW) at the frequency of 14.23 GHz. The signal can be decoded by the atomic receiver itself but more obvious with the introduction of an auxiliary microwave (A-MW) field. The receiver’s amplitude variations corresponding to microwave field are simulated by solving density matrices to give this mechanism theoretical support. An appropriate AM frequency is obtained by optimizing the signal-to-noise ratio, guaranteeing both large data transfer capacity (DTC) and high fidelity of the receiver. The power of two MW fields, along with the B-MW field frequency, is studied to acquire larger DTC and wider operating bandwidth. Finally, the readout of PRBS signals is performed by both the proposed and conventional mechanisms, and the comparison proves the obvious increment of DTC with the proposed scheme. This proof-of-principle demonstration exhibits the potential of the dual-tone scheme and offers a novel pathway for Rydberg atom-based microwave communication, which is beneficial for long-distance communication and weak signal perception outside the laboratory.

中文翻译：

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基于里德堡原子的双音微波场调幅接收器

我们提出了一种基于里德堡原子的接收器，用于利用双音微波场进行调幅（AM）接收。伪随机二进制序列 (PRBS) 信号在频率为 14.23 GHz 的基本微波场 (B-MW) 中进行编码。信号可以由原子接收器本身解码，但随着辅助微波 (A-MW) 场的引入，信号的解码效果会更加明显。通过求解密度矩阵来模拟微波场对应的接收器幅度变化，为该机制提供理论支持。通过优化信噪比获得合适的AM频率，保证接收器的大数据传输容量（DTC）和高保真度。研究了两个MW场的功率以及B-MW场频率以获得更大的DTC和更宽的工作带宽。最后，通过所提出的机制和传统的机制执行PRBS信号的读出，并且比较证明了所提出的方案的DTC的明显增量。这一原理验证演示展示了双音方案的潜力，并为基于里德伯原子的微波通信提供了一种新颖的途径，这有利于实验室外的长距离通信和微弱信号感知。