Marino A M, Boyer V, Lett P D
Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland, Gaithersburg, MD 20899, USA.
Phys Rev Lett. 2008 Jun 13;100(23):233601. doi: 10.1103/PhysRevLett.100.233601. Epub 2008 Jun 10.
We have observed a violation of the Cauchy-Schwarz inequality in the macroscopic regime by more than 8 standard deviations. The violation has been obtained while filtering out only the low-frequency noise of the quantum-correlated beams that results from the technical noise of the laser used to generate them. We use bright intensity-difference squeezed beams produced by four-wave mixing as the source of the correlated fields. We also demonstrate that squeezing does not necessarily imply a violation of the Cauchy-Schwarz inequality.
我们观察到在宏观状态下违反了柯西-施瓦茨不等式超过8个标准差。这种违反是在仅滤除量子关联光束的低频噪声时获得的，该低频噪声源于用于产生它们的激光的技术噪声。我们使用四波混频产生的明亮强度差压缩光束作为相关场的源。我们还证明了压缩并不一定意味着违反柯西-施瓦茨不等式。
