Dissipation-Based Quantum Sensing of Magnons with a Superconducting Qubit

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 superc...

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Bibliographic Details
Published in:	Physical review letters Vol. 125; no. 11; pp. 1 - 117701
Main Authors:	Wolski, S. P., Lachance-Quirion, D., Tabuchi, Y., Kono, S., Noguchi, A., Usami, K., Nakamura, Y.
Format:	Journal Article
Language:	English
Published:	College Park American Physical Society 11-09-2020
Subjects:	Ferrimagnetism Magnons Qubits (quantum computing) Superconductivity
Online Access:	Get full text
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Summary:	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/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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.125.117701