Stochastic resonance, a phenomenon that amplifies and detects weak signals, has been observed in various physical systems. However, due to the challenge of constructing controllable nonlinear damping, stochastic resonance has never been experimentally performed using van der Pol nonlinearity. Here, we report the experimental observation of stochastic resonance in a single trapped-ion phonon laser system exhibiting van der Pol nonlinearity. This experiment demonstrates the ability of the phonon laser to achieve stochastic resonance, amplifying weak signals via inputting additional noise at a single-atom level. Our experiment illustrates the single-ion phonon laser providing a platform to explore the physical properties of the nonlinear van der Pol oscillator. This work opens up a way for designing single-atomic devices for weak signal processing in real environments.

中文翻译：

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通过单离子声子激光进行随机共振


随机共振是一种放大和检测微弱信号的现象，已在各种物理系统中观察到。然而，由于构建可控非线性阻尼的挑战，随机共振从未使用范德波尔非线性进行过实验。在这里，我们报告了在表现出范德波尔非线性的单个囚禁离子声子激光系统中随机共振的实验观察。该实验证明了声子激光器实现随机共振的能力，通过在单原子水平上输入额外的噪声来放大微弱信号。我们的实验说明了单离子声子激光器为探索非线性范德波尔振荡器的物理性质提供了一个平台。这项工作为设计用于真实环境中弱信号处理的单原子器件开辟了一条道路。