Quantum engineering of squeezed states for quantum communication and metrology

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Abstract

We report the experimental realization of squeezed quantum states of light, tailored for new applications in quantum communication and metrology. Squeezed states in a broad Fourier frequency band down to 1 Hz have been observed for the first time. Nonclassical properties of light in such a low frequency band are required for high efficiency quantum information storage in electromagnetically induced transparency (EIT) media. The states observed also cover the frequency band of ultra-high precision laser interferometers for gravitational wave detection and can be used to reach the regime of quantum non-demolition interferometry. Furthermore, they cover the frequencies of motion of heavy macroscopic objects and might therefore support attempts to observe entanglement in our macroscopic world. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

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Vahlbruch, H., Chelkowski, S., Danzmann, K., & Schnabel, R. (2007). Quantum engineering of squeezed states for quantum communication and metrology. New Journal of Physics, 9. https://doi.org/10.1088/1367-2630/9/10/371

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