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23 April 2024

» arxiv » 2005.9250

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Dissipation-based Quantum Sensing of Magnons with a Superconducting Qubit
Samuel Piotr Wolski ; Dany Lachance-Quirion ; Yutaka Tabuchi ; Shingo Kono ; Atsushi Noguchi ; Koji Usami ; Yasunobu Nakamura ;
Date:	19 May 2020
Abstract:	Hybrid quantum devices expand the tools and techniques available for quantum sensing in various fields. Here, we experimentally demonstrate quantum sensing of the steady-state magnon population in a magnetostatic mode of a ferrimagnetic crystal. Dispersively coupling the magnetostatic mode to a superconducting qubit allows the detection of magnons using Ramsey interferometry with a sensitivity on the order of $10^{-3}$ $ ext{magnons}/sqrt{ ext{Hz}}$. The protocol is based on dissipation as dephasing via fluctuations in the magnetostatic mode reduces the qubit coherence proportionally to the number of magnons.
Source:	arXiv, 2005.9250
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