Reduction of quantum noise in optical interferometers using squeezed light |
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Authors: | M Weyrauch V G Voronov |
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Institution: | 1.Physikalisch-Technische Bundesanstalt,Braunschweig,Germany;2.Faculty of Physics,Taras Shevchenko National University of Kyiv,Kyiv,Ukraine |
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Abstract: | We study the photon counting noise in optical interferometers used for gravitational wave detection. In order to reduce quantum
noise a squeezed vacuum state is injected into the usually unused input port. Here, we specifically investigate the so-called
“dark port case,” when the beam splitter is oriented close to 90° to the incoming laser beam, such that nearly all photons
go to one output port of the interferometer, and only a small fraction of photons is seen in the other port (“dark port”).
For this case it had been suggested that signal amplification is possible without concurrent noise amplification R. Barak
and Y. Ben-Aryeh, J. Opt. Soc. Am. B 25, 361 (2008)]. We show that by injection of a squeezed vacuum state into the second input port, counting noise is reduced
for large values of the squeezing factor, however the signal is not amplified. Signal strength only depends on the intensity
of the laser beam. |
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Keywords: | |
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