added Schnabel paper

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@@ -4750,3 +4750,20 @@ eprint = {http://www.tandfonline.com/doi/pdf/10.1080/09500340903159495}
 	see additional noise from the light-atom interaction.} 
 }
 
+@article{schnabel2005pra_squeezing_control,
+	title = {Experimental characterization of frequency-dependent squeezed light},
+	author = {Chelkowski, Simon and Vahlbruch, Henning and Hage, Boris and Franzen, Alexander and Lastzka, Nico and Danzmann, Karsten and Schnabel, Roman},
+	journal = {Phys. Rev. A},
+	month = {Jan},
+	url = {http://link.aps.org/doi/10.1103/PhysRevA.71.013806},
+	doi = {10.1103/PhysRevA.71.013806},
+	volume = {71},
+	year = {2005},
+	issue = {1},
+	publisher = {American Physical Society},
+	numpages = {8},
+	pages = {013806},
+	abstract = {
+		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 ±1° 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.
+	}
+}