物理
马格农
超导电性
量子位元
凝聚态物理
消散
量子力学
电荷量子位
量子
相位量子位
铁磁性
作者
Samuel Wolski,Dany Lachance-Quirion,Yoshihiko Tabuchi,Shingo Kono,Atsushi Noguchi,Koji Usami,Y. Nakamura
标识
DOI:10.1103/physrevlett.125.117701
摘要
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 $10^{-3}$ $\text{magnons}/\sqrt{\text{Hz}}$. The protocol is based on dissipation as dephasing via fluctuations in the magnetostatic mode reduces the qubit coherence proportionally to the number of magnons.
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