Jiang Cheng, Ji Baowei, Cui Yuanshun, Zuo Fen, Shi Jin, Chen Guibin
Opt Express. 2018 Jun 11;26(12):15255-15267. doi: 10.1364/OE.26.015255.
We theoretically propose a scheme for realizing a quantum-limited directional amplifier in a triple-cavity optomechanical system, where one microwave cavity and two optical cavities are, respectively, coupled to a common mechanical resonator. Moreover, the two optical cavities are coupled directly to facilitate the directional amplification between microwave and optical photons. We find that directional amplification between the three cavity modes is achieved with two gain process and one conversion process, and the direction of amplification can be modulated by controlling the phase difference between the field-enhanced optomechanical coupling strengths. Furthermore, with increasing the optomechanical cooperativity, both gain and bandwidth of the directional amplifier can be enhanced, and the noise added to the amplifier can be suppressed to approach the standard quantum limit on the phase-preserving linear amplifier.
我们从理论上提出了一种在三腔光机械系统中实现量子极限定向放大器的方案，其中一个微波腔和两个光学腔分别与一个公共机械谐振器耦合。此外，两个光学腔直接耦合，以促进微波光子和光学光子之间的定向放大。我们发现，通过两个增益过程和一个转换过程实现了三个腔模之间的定向放大，并且放大方向可以通过控制场增强光机械耦合强度之间的相位差来调制。此外，随着光机械协同性的增加，定向放大器的增益和带宽都可以提高，并且添加到放大器中的噪声可以被抑制，以接近保相线性放大器的标准量子极限。
