CHEN Guanyu; WANG Cheng; YANG Bin; ZHOU Pengpeng; CHEN Tiantian; WU Yuchen

doi:10.7498/aps.74.20250944

Abstract

Rydberg atoms possess a large electric dipole moment and exhibit high sensitivity to electromagnetic signals. Receivers based on Rydberg atoms represent a novel reception mechanism, demonstrating broad application prospects in the field of communication. Current research has not addressed the influence of the operating parameters of Rydberg atomic receiver on channel capacity. This study establishes a channel capacity model for Rydberg atomic receiver based on Shannon's formula and the response mechanism of the electromagnetically induced transparency (EIT) effect. Using this model, the influences of atomic number density, laser beam waist, and coupling laser Rabi frequency on the channel capacity of Rydberg atomic receiver are analyzed. A strategy for optimizing channel capacity by adjusting the coupling laser Rabi frequency is proposed, and an analytical solution for the Rabi frequency that maximizes channel capacity is derived. The accuracy of this analytical solution is then verified through numerical simulations. The channel capacity corresponding to the analytical solution in this study is similar to the optimal channel capacity obtained using the one-dimensional optimization method (Newton’s method) and is superior to the results obtained by the quadratic interpolation method, demonstrating the effectiveness of the proposed analytical solution in optimizing the channel capacity of Rydberg atomic receiver. This research provides theoretical guidance for designing high-performance Rydberg atomic receiver and optimizing channel capacity.

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Corresponding author: WANG Cheng, wangc1132024@163.com

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 62171469, 62071029).

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符号	含义	参数的变化对信道容量的影响程度
$ {\varOmega _{\text{c}}} $	耦合光拉比频率	$ {\varOmega _{\text{c}}} $从$ 2\pi \times 10{\text{ MHz}} $提升至$ 2\pi \times 15{\text{ MHz}} $, 信道容量提升约8—14 Mbit/s
$ {\varOmega _{\text{p}}} $	探测光拉比频率	$ {\varOmega _{\text{p}}} $从$ 2\pi \times 1{\text{ MHz}} $提升至$ 2\pi \times 3{\text{ MHz}} $, 信道容量提升约1 Mbit/s ($ {\varOmega _{\text{p}}} $通常取值较小)
$ {\varOmega _{{\text{RF}}}} $	信号场拉比频率	$ {\varOmega _{{\text{RF}}}} $从$ 2\pi \times 5{\text{ MHz}} $提升至$ 2\pi \times 15{\text{ MHz}} $, 信道容量提升约5 Mbit/s
$ n $	原子数密度	$ n $从$ 25 \times {10^{16}}{\text{ }}{{\text{m}}^{ - 3}} $提升至$ 100 \times {10^{16}}{\text{ }}{{\text{m}}^{ - 3}} $, 信道容量提升约8 Mbit/s
$ r $	激光束腰	$ r $从$ 25{\text{ μm}} $提升至$ 125{\text{ μm}} $, 信道容量提升约8—12 Mbit/s
$ L $	原子气室长度	信道容量随$ L $的增大略有提升
$ {{{\varGamma }}_i} $	能级$ \| i \rangle $自发辐射衰变速率	由实验设置确定
$ {\omega _{\text{p}}} $	探测光频率	由实验设置确定
$ {q_{\text{d}}} $	探测效率	固定值
$ {\varepsilon _0} $	真空介电常数	固定值
$ \hbar $	约化普朗克常数	固定值
$ \delta $	里德伯态失谐	固定值

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Vol. 74, Issue 22 - 2025-11-20

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