Max Planck Institut für Quantenoptik, D-85748 Garching, Germany.
Phys Rev Lett. 2010 Jan 22;104(3):033901. doi: 10.1103/PhysRevLett.104.033901. Epub 2010 Jan 19.
We present an optomechanical displacement transducer that relies on three cavity modes parametrically coupled to a mechanical oscillator and whose frequency spacing matches the mechanical resonance frequency. The additional resonances allow reaching the standard quantum limit at a substantially lower input power (compared to the case of a single cavity mode), as both sensitivity and quantum backaction are enhanced. Furthermore, it is shown that in the case of multiple cavity modes, coupling between the modes is induced via reservoir interaction, e.g., enabling quantum backaction noise cancellation. Experimental implementation of the schemes is discussed in both the optical and microwave domain.
我们提出了一种基于参量耦合到机械振子的三个腔模的光机械位移传感器，其频率间隔与机械共振频率匹配。附加的共振允许在低得多的输入功率下达到标准量子极限（与单个腔模的情况相比），因为灵敏度和量子反作用都得到了增强。此外，还表明在多个腔模的情况下，模式之间的耦合是通过库相互作用诱导的，例如，能够消除量子反作用噪声。在光学和微波领域都讨论了方案的实验实现。
