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Low-loss adiabatic fiber-optic coupler for cryogenic photonics

Mengdi Zhao and Kejie Fang

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Abstract

Recent developments in quantum light–matter coupled systems and quantum transducers have highlighted the need for cryogenic optical measurements. In this study, we present a packaged fiber-optic coupler with a coupling efficiency of over 50% for telecom wavelength light down to the mK temperature range. Besides the high coupling efficiency, our method enables sensitive photonic device measurements that are immune to mechanical vibrations present in cryogenic setups.

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Data supporting the findings of this study are available within the article and Supplement 1, or from the corresponding author upon reasonable request.

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