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We demonstrate a possibility to control the noise spectrum of squeezed vacuum by passing it through Rb vapor under EIT conditions. For this experiment, we generate low sideband frequency (1kHz-2MHz) squeezed vacuum using polarization self-rotation. As an example, we compare the quadrature noise levels to theoretical predictions and observe ‘EIT filtering’ of the noise due to the finite width of the EIT resonance. This work may lead to the development of a low-cost compact squeezing source for applications in gravitational wave interferometers and continuous-variable quantum memory systems.
© 2011 Optical Society of America
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