Experimental characterization of frequency-dependent squeezed light
Experimental characterization of frequency-dependent squeezed light
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DOI：
10.1103/physreva.71.013806
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发表时间：
2005-01-01
影响因子：
2.9
通讯作者：
Schnabel, R
中科院分区：
文献类型：
--
作者：
Chelkowski, S;Vahlbruch, H;Schnabel, R
我们报道了显示压缩椭圆方向随频率变化的宽带压缩激光束的演示。载流子频率和正交角稳定锁定在1064nm的参考激光束上。用噪声功率谱和维格纳函数的轮廓图来表征这种频率相关的压缩。后者通过量子态层析成像测量。我们的层析成像允许对任意正交角的本地振荡光束进行稳定锁定，精度为+/-1度。在第三代引力波干涉仪中，压缩椭圆的频率依赖方向是压缩光态所必需的，以提供宽带灵敏度的改进。我们考虑将我们的系统应用于长基线干涉仪，如未来的压缩光升级GEO 600探测器。
We report on the demonstration of broadband squeezed laser beams that show a frequency-dependent orientation of the squeezing ellipse. Carrier frequency as well as quadrature angle were stably locked to a reference laser beam at 1064 nm. This frequency-dependent squeezing was characterized in terms of noise power spectra and contour plots of Wigner functions. The latter were measured by quantum state tomography. Our tomograph allowed a stable lock to a local oscillator beam for arbitrary quadrature angles with +/-1degrees precision. Frequency-dependent orientations of the squeezing ellipse are necessary for squeezed states of light to provide a broadband sensitivity improvement in third-generation gravitational-wave interferometers. We consider the application of our system to long-baseline interferometers such as a future squeezed-light upgraded GEO 600 detector.