Squeezed vacuum states from a whispering gallery mode resonator
Abstract
Squeezed vacuum states enable optical measurements below the quantum limit and hence are a valuable resource for applications in quantum metrology and also quantum communication. However, most available sources require high pump powers in the milliwatt range and large setups, which hinders real world applications. Furthermore, degenerate operation of such systems presents a challenge. Here, we use a compact crystalline whispering gallery mode resonator made of lithium niobate as a degenerate parametric oscillator. We demonstrate about 1.4 dB noise reduction below the shot noise level for only 300 of pump power in degenerate single mode operation. Furthermore, we report a record pump threshold as low as 1.35 . Our results show that the whispering gallery based approach presents a promising platform for a compact and efficient source for nonclassical light.
Cite
@article{arxiv.1905.07955,
title = {Squeezed vacuum states from a whispering gallery mode resonator},
author = {Alexander Otterpohl and Florian Sedlmeir and Ulrich Vogl and Thomas Dirmeier and Golnoush Shafiee and Gerhard Schunk and Dmitry V. Strekalov and Harald G. L. Schwefel and Tobias Gehring and Ulrik L. Andersen and Gerd Leuchs and Christoph Marquardt},
journal= {arXiv preprint arXiv:1905.07955},
year = {2019}
}
Comments
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