Embrey Christopher S, Hordell Joshua, Petrov Plamen G, Boyer Vincent
Opt Express. 2016 Nov 28;24(24):27298-27308. doi: 10.1364/OE.24.027298.
We experimentally study a homodyne detection technique for the characterization of a quadrature squeezed field where the correlated bands, here created by four-wave mixing in a hot atomic vapor, are separated by a large frequency gap of more than 6 GHz. The technique uses a two-frequency local oscillator to detect the fluctuations of the correlated bands at a frequency accessible to the detection electronics. Working at low detection frequency, the method allows for the determination of both the amplitude and the phase of the squeezing spectrum. In particular, we show that the quadrature squeezing created by our four-wave mixing process displays a noise ellipse rotation of π/2 across the squeezing spectrum.
我们通过实验研究了一种零差探测技术，用于表征正交压缩场，其中由热原子蒸汽中的四波混频产生的相关频带被超过6GHz的大频率间隔分开。该技术使用双频本地振荡器来检测相关频带在检测电子设备可及频率处的波动。在低检测频率下工作，该方法允许确定压缩谱的幅度和相位。特别是，我们表明，由我们的四波混频过程产生的正交压缩在整个压缩谱上显示出π/2的噪声椭圆旋转。
