Lei C U, Weinstein A J, Suh J, Wollman E E, Kronwald A, Marquardt F, Clerk A A, Schwab K C
Applied Physics, California Institute of Technology, Pasadena, California 91125, USA.
Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
Phys Rev Lett. 2016 Sep 2;117(10):100801. doi: 10.1103/PhysRevLett.117.100801. Epub 2016 Aug 30.
We use a reservoir engineering technique based on two-tone driving to generate and stabilize a quantum squeezed state of a micron-scale mechanical oscillator in a microwave optomechanical system. Using an independent backaction-evading measurement to directly quantify the squeezing, we observe 4.7±0.9 dB of squeezing below the zero-point level surpassing the 3 dB limit of standard parametric squeezing techniques. Our measurements also reveal evidence for an additional mechanical parametric effect. The interplay between this effect and the optomechanical interaction enhances the amount of squeezing obtained in the experiment.
我们使用基于双音驱动的储层工程技术，在微波光机械系统中产生并稳定微米级机械振子的量子压缩态。通过使用独立的背向作用规避测量来直接量化压缩，我们观察到在零点水平以下有4.7±0.9 dB的压缩，超过了标准参量压缩技术的3 dB极限。我们的测量还揭示了一种额外机械参量效应的证据。这种效应与光机械相互作用之间的相互作用增强了实验中获得的压缩量。
