标题： 通过原子与光之间的量子关联在拉曼放大器中观察量子噪声减少 显示英文标题

标题： Observation of quantum noise reduction in a Raman amplifier via quantum correlation between atom and light

摘要： 任何放大器都需要与其内部自由度耦合以获得能量增益。 这种耦合会向输出引入额外的量子噪声。 另一方面，如果可以访问和操作放大器的内部自由度，我们可以管理和甚至减少放大器输出的量子噪声。 在本文中，我们展示了一个实验，通过将原子介质与斯托克斯光场制备成关联态来减少拉曼放大器的量子噪声。 我们报告了在原子拉曼放大过程中观测到超过 3.5 分贝的量子噪声减少。 从另一个角度来看，高增益的拉曼放大器反过来可以作为测量原子与光之间量子关联的测量工具。 此外，从整体上看，这种方案还形成了一个量子纠缠的原子-光混合干涉仪，可以导致量子增强的传感器。 显示英文摘要

摘要： Any amplifier requires coupling to its internal degrees of freedom for energy gain. This coupling introduces extra quantum noise to the output. On the other hand, if the internal degree of the amplifier can be accessed and manipulated, we can manage and even reduce the quantum noise of the amplifier's output. In this paper, we present an experiment to reduce the quantum noise of a Raman amplifier by preparing the atomic medium in a correlated state with the Stokes light field. We report an observation of quantum noise reduction of more than 3.5 dB in the atomic Raman amplification process. From another perspective, the Raman amplifier at high gain in turn serves as a measurement tool for the quantum correlation between the atom and light. Furthermore, such a scheme, when viewed as a whole, also forms a quantum-entangled atom-light hybrid interferometer that can lead to quantum-enhanced sensors.