Dissipation-based Quantum Sensing of Magnons with a Superconducting Qubit

• URL: http://arxiv.org/abs/2005.09250v1
• Date: Tue, 19 May 2020 07:01:25 GMT
• Title: Dissipation-based Quantum Sensing of Magnons with a Superconducting Qubit
• Authors: Samuel Piotr Wolski, Dany Lachance-Quirion, Yutaka Tabuchi, Shingo Kono, Atsushi Noguchi, Koji Usami, Yasunobu Nakamura
• Abstract summary: We experimentally demonstrate quantum sensing of the steady-state magnon population in a magnetostatic mode of a ferrimagnetic crystal. The protocol is based on dissipation as dephasing via fluctuations in the magnetostatic mode reduces the qubit coherence proportionally to the number of magnons.
• Score: 0.2770822269241974
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 $10^{-3}$ $\text{magnons}/\sqrt{\text{Hz}}$. 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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