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Millikelvin measurements of permittivity and loss tangent of lithium niobate

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arxiv 2302.12916 v4 pith:J5OQL7UN submitted 2023-02-24 quant-ph cond-mat.mtrl-sci

Silvia Zorzetti , Changqing Wang , Ivan Gonin , Sergey Kazakov , Timergali Khabiboulline , Alexander Romanenko , Vyacheslav P Yakovlev , Anna Grassellino This is my paper · ORCID
classification quant-phcond-mat.mtrl-sci
keywords lithiumniobatepermittivitylossmeasurementsmillikelvinquantumtangent
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Lithium Niobate is an electro-optic material with many applications in microwave signal processing, communication, quantum sensing, and quantum computing. In this letter, we present findings on evaluating the complex electromagnetic permittivity of lithium niobate at millikelvin temperatures. Measurements are carried out using a resonant-type method with a superconducting radio-frequency (SRF) cavity operating at 7 GHz and designed to characterize anisotropic dielectrics. The relative permittivity tensor and loss tangent are measured at 50 mK with unprecedented accuracy.

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