Quantitative calibration of a TWPA applied to an optomechanical platform

• URL: http://arxiv.org/abs/2505.05837v1
• Date: Fri, 09 May 2025 07:05:25 GMT
• Title: Quantitative calibration of a TWPA applied to an optomechanical platform
• Authors: Alexandre Delattre, Ilya Golokolenov, Richard Pedurand, Nicolas Roch, Arpit Ranadive, Martina Esposito, Luca Planat, Andrew Fefferman, Eddy Collin, Xin Zhou, Mika A. Sillanpaa, Laure Mercier de Lepinay, Andrew D. Armour, Jonas Glatthard,
• Abstract summary: We report on near quantum-limited measurements performed with an aluminum drumhead mechanical device within the temperature range 4 mK - 400 mK.<n>The power and temperature dependence is studied over the full parameter range, leading to an absolute definition of phonon population.
• Score: 31.318239785986396
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In the last decade, the microwave quantum electronics toolbox has been enriched with quantum limited detection devices such as Traveling Wave Parametric Amplifiers (TWPAs). The extreme sensitivity they provide is not only mandatory for some physics applications within quantum information processing, but is also the key element that will determine the detection limit of quantum sensing setups. In the framework of microwave optomechanical systems, an unprecedented range of small motions and forces is accessible, for which a specific quantitative calibration becomes necessary. We report on near quantum-limited measurements performed with an aluminum drumhead mechanical device within the temperature range 4 mK - 400 mK. The whole setup is carefully calibrated, especially taking into account the power-dependence of microwave absorption in the superconducting optomechanical cavity. This effect is commonly attributed to Two-Level-Systems (TLSs) present in the metal oxide. We demonstrate that a similar feature exists in the TWPA, and can be phenomenologically fit with adapted expressions. The power and temperature dependence is studied over the full parameter range, leading to an absolute definition of phonon population (i.e. Brownian motion amplitude), with an uncertainty +-20 %.

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