Experimental characterization of frequency dependent squeezed light

Details Experimental characterization of frequency dependent squeezed light Experimental characterization of frequency dependent squeezed light

2007-06-29

arxiv.org/abs/0706.4479v1

Physical Review A 71, 013806 (2005)

Physics

Quantum Physics

8 pages, 8 figures

Scientific paper

10.1103/PhysRevA.71.013806

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 1064nm. This frequency dependent squeezing was characterized in terms of noise power spectra and contour plots of Wigner functions. The later were measured by quantum state tomography. Our tomograph allowed a stable lock to a local oscillator beam for arbitrary quadrature angles with one degree 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 GEO600 detector.

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