论文标题
宽带相干多维变分测量
Broadband Coherent Multidimensional Variational Measurement
论文作者
论文摘要
经典机械力检测的标准量子极限（SQL）是由于机械系统扰动演变而产生的。在本文中，我们表明多维光学传感器的用法可能会实现避开宽带量子反向动作的测量。我们研究了一项相应的技术，用于测量作用在线性机械振荡器上的谐振信号力，该线性机械振荡器与光学系统耦合，具有三种光学模式，其分离几乎等于机械频率。测量是通过光学泵送中心光学模式进行的，并测量了其他两种模式的光。通过检测光学模式的最佳正交成分并进行后处理测量结果，我们能够在宽频段中排除背部动作，并以比SQL更好地表征力的力。我们讨论提出的方案与包含无量子力学子系统（QMF）的多维系统如何相关，这些系统可以使用所谓的“负质量”的概念来逃避SQL。
Standard Quantum Limit (SQL) of a classical mechanical force detection results from quantum back action perturbing evolution of a mechanical system. In this paper we show that usage of a multidimensional optical transducer may enable a broadband quantum back action evading measurement. We study a corresponding technique for measurement of a resonant signal force acting on a linear mechanical oscillator coupled to an optical system with three optical modes with separation nearly equal to the mechanical frequency. The measurement is performed by optical pumping of the central optical mode and measuring the light escaping the two other modes. By detecting optimal quadrature components of the optical modes and post-processing the measurement results we are able to exclude the back action in a broad frequency band and characterize the force with sensitivity better than SQL. We discuss how proposed scheme relates to multidimensional system containing quantum-mechanics-free subsystems (QMFS) which can evade the SQL using idea of so called "negative mass".
