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Squeezed vacuum states from a whispering gallery mode resonator

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arxiv 1905.07955 v2 pith:EMLRJMNX submitted 2019-05-20 quant-ph

Alexander Otterpohl , Florian Sedlmeir , Ulrich Vogl , Thomas Dirmeier , Golnoush Shafiee , Gerhard Schunk , Dmitry V. Strekalov , Harald G. L. Schwefel
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Tobias Gehring Ulrik L. Andersen Gerd Leuchs Christoph Marquardt
This is my paper · ORCID
classification quant-ph
keywords degenerategallerymodepumpquantumwhisperingapplicationsbelow
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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 $\mu\text{W}$ of pump power in degenerate single mode operation. Furthermore, we report a record pump threshold as low as 1.35 $\mu\text{W}$. Our results show that the whispering gallery based approach presents a promising platform for a compact and efficient source for nonclassical light.

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  1. A Compact, Mobile, Low-Threshold Squeezed Light Source

    quant-ph 2019-09 conditional novelty 5.0 of 10

    A 30 cm by 45 cm hybrid fiber/free-space setup produces 9.3 dB of squeezed light at 1550 nm with a 5.2 mW threshold and a projected path to over 10 dB.

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