Dissipation-Based Quantum Sensing of Magnons with a Superconducting Qubit Article Swipe

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Dissipation Qubit Superconductivity Physics Magnon Charge qubit Phase qubit Quantum Condensed matter physics Quantum mechanics Ferromagnetism

Samuel Wolski , Dany Lachance-Quirion , Yutaka Tabuchi , S. Kono , Atsushi Noguchi , Koji Usami , Yasunobu Nakamura ·

YOU? · · 2020 · Open Access · · DOI: https://doi.org/10.1103/physrevlett.125.117701 · OA: W3026681027

Hybrid quantum devices expand the tools and techniques available for quantum sensing in various fields. Here, we experimentally demonstrate quantum sensing of a steady-state magnon population in a magnetostatic mode of a ferrimagnetic crystal. Dispersively coupling the magnetostatic mode to a superconducting qubit allows for the detection of magnons using Ramsey interferometry with a sensitivity on the order of 10^{-3} magnons/sqrt[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.