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Probing strong coupling between a microwave cavity and a spin ensemble with Raman heterodyne spectroscopy

King, Gavin G. G. and Barnett, Peter S. and Bartholomew, John G. and Faraon, Andrei and Longdell, Jevon J. (2021) Probing strong coupling between a microwave cavity and a spin ensemble with Raman heterodyne spectroscopy. Physical Review B, 103 (21). Art. No. 214305. ISSN 2469-9950. doi:10.1103/PhysRevB.103.214305.

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Raman heterodyne spectroscopy is a powerful tool for characterizing the energy and dynamics of spins. The technique uses an optical pump to transfer coherence from a spin transition to an optical transition where the coherent emission is more easily detected. Here Raman heterodyne spectroscopy is used to probe an isotopically purified ensemble of erbium dopants in a yttrium orthosilicate (Y₂SiO₅) crystal coupled to a microwave cavity. Because the erbium electron spin transition is strongly coupled to the microwave cavity, we observed Raman heterodyne signals at the resonant frequencies of the hybrid spin-cavity modes (polaritons) rather than the bare erbium spin-transition frequency. Using the coupled system, we made saturation recovery measurements of the ground-state spin relaxation time T₁ = 10±3 s and also observed Raman heterodyne signals using an excited state spin transition. We discuss the implications of these results for efforts toward converting microwave quantum states to optical quantum states.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Barnett, Peter S.0000-0002-6100-7607
Bartholomew, John G.0000-0003-0780-2471
Faraon, Andrei0000-0002-8141-391X
Longdell, Jevon J.0000-0002-2876-3152
Additional Information:© 2021 American Physical Society. Received 24 January 2021; revised 2 May 2021; accepted 27 May 2021; published 14 June 2021. We would like to thank Tian Xie and Jake Rochman for useful discussions and practical help setting up the experiments. G.G.G.K. wishes to thank Harald Schwefel and Niels Kjærgaard for invaluable critical discussions. This work was supported by the USA Army Research Office (ARO/LPS) (CQTS) Grant No. W911NF1810011 and the Marsden Fund of the Royal Society of New Zealand (Contract No. UOO1520).
Funding AgencyGrant Number
Army Research Office (ARO)W911NF1810011
Marsden Fund of the Royal Society of New ZealandUOO1520
Issue or Number:21
Record Number:CaltechAUTHORS:20210622-224021898
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109542
Deposited By: Tony Diaz
Deposited On:23 Jun 2021 18:40
Last Modified:23 Jun 2021 18:40

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