Ultrastrong coupling between a microwave resonator and antiferromagnetic resonances of rare earth ion spins

Gavin G. G. King; Jevon J. Longdell; Jonathan Everts; Nicholas Lambert; Sacha Kocsis; Sven Rogge

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Ultrastrong coupling between a microwave resonator and antiferromagnetic resonances of rare earth ion spins

Jonathan Everts, Gavin G. G. King, Nicholas Lambert, Sacha Kocsis, Sven Rogge, Jevon J. Longdell

Quantum Physics · Submitted 26 Nov 2019

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim Here we show the first experimental evidence of ultrastrong-coupling between a microwave cavity and collective antiferromagnetic resonances (magnons) in a rare earth crystal.

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arXiv ID1911.11311 (version 1)

Pith IDZF3W46IZ, Pith's permanent record of this paper and its review

CitationGavin G. G. King, Jevon J. Longdell, Jonathan Everts, Nicholas Lambert, Sacha Kocsis, Sven Rogge. "Ultrastrong coupling between a microwave resonator and antiferromagnetic resonances of rare earth ion spins." arXiv:1911.11311 (2019). https://pith.science/paper/ZF3W46IZ

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,343 input tokens.

What the abstract itself states, as probabilities: claims first 0.96 · states limitation 0.07 · human participants 0.02 · controlled comparison 0.03 · randomized assignment 0.01 · states quantitative result 0.06 · compares with prior results 0.79 · mentions code or data availability 0.02.

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Quantum magnonics is a new and active research field, leveraging the strong collective coupling between microwaves and magnetically ordered spin systems. To date work in quantum magnonics has focused on transition metals and almost entirely on ferromagnetic resonances in yttrium iron garnet (YIG). Antiferromagnetic systems have gained interest as they produce no stray field, and are therefore robust to magnetic perturbations and have narrow, shape independent resonant linewidths. Here we show the first experimental evidence of ultrastrong-coupling between a microwave cavity and collective antiferromagnetic resonances (magnons) in a rare earth crystal. The combination of the unique optical and spin properties of the rare earths and collective antiferromagnetic order paves the way for novel quantum magnonic applications.

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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	Quantum magnonics is a new and active research field, leveraging the strong collective coupling between microwaves and magnetically ordered spin systems.	background 1.00	0.04	0.03	asserted 1.00
s1	To date work in quantum magnonics has focused on transition metals and almost entirely on ferromagnetic resonances in yttrium iron garnet (YIG).	background 0.53	0.03	0.02	asserted 1.00
s2	Antiferromagnetic systems have gained interest as they produce no stray field, and are therefore robust to magnetic perturbations and have narrow, shape independent resonant linewidths.	background 0.99	0.06	0.03	asserted 1.00
s3	Here we show the first experimental evidence of ultrastrong-coupling between a microwave cavity and collective antiferromagnetic resonances (magnons) in a rare earth crystal.	contribution 0.58	0.97	0.93	asserted 1.00
s4	The combination of the unique optical and spin properties of the rare earths and collective antiferromagnetic order paves the way for novel quantum magnonic applications.	interpretation 0.89	0.14	0.15	hedged possibility 0.49

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Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

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Original abstract

Quantum magnonics is a new and active research field, leveraging the strong collective coupling between microwaves and magnetically ordered spin systems. To date work in quantum magnonics has focused on transition metals and almost entirely on ferromagnetic resonances in yttrium iron garnet (YIG). Antiferromagnetic systems have gained interest as they produce no stray field, and are therefore robust to magnetic perturbations and have narrow, shape independent resonant linewidths. Here we show the first experimental evidence of ultrastrong-coupling between a microwave cavity and collective antiferromagnetic resonances (magnons) in a rare earth crystal. The combination of the unique optical and spin properties of the rare earths and collective antiferromagnetic order paves the way for novel quantum magnonic applications.

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What it cites

Cites as background 1 paper

Amongst the challenges that the hybrid approach tries to address is the long term storage of quantum information by using spins, as well as long distance, room temperature, quantum communication by microwave to optical conversion [ref] .

Coherent conversion between microwave and optical photons -- an overview of physical implementations · Introduction · 0.82

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