Cavity Quantum Electrodynamics Effects with Nitrogen Vacancy Center Spins Coupled to Room Temperature Microwave Resonators

Yuan Zhang, Qilong Wu, Shi-Lei Su, Qing Lou, Chongxin Shan, and Klaus Mølmer
Phys. Rev. Lett. 128, 253601 – Published 24 June 2022
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Abstract

Cavity quantum electrodynamics (CQED) effects, such as Rabi splitting, Rabi oscillations, and superradiance, have been demonstrated with nitrogen vacancy (NV) center spins in diamond coupled to microwave resonators at cryogenic temperature. In this Letter, we explore the possibility to realize strong collective coupling and CQED effects with ensembles of NV spins at room temperature. Our calculations show that thermal excitation of the individual NV spins leads to population of collective Dicke states with low symmetry and a reduced collective coupling to the microwave resonators. Optical pumping can be applied to counteract the thermal excitation of the NV centers and to prepare the spin ensemble in Dicke states with high symmetry. The resulting strong coupling with high-quality resonators enables the study of intriguing CQED effects across the weak-to-strong coupling regime, and may have applications in quantum sensing and quantum information processing.

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  • Received 1 November 2021
  • Accepted 17 May 2022

DOI:https://doi.org/10.1103/PhysRevLett.128.253601

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Yuan Zhang*, Qilong Wu, Shi-Lei Su, Qing Lou, and Chongxin Shan

  • Henan Key Laboratory of Diamond Optoelectronic Materials and Devices, Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China

Klaus Mølmer

  • Aarhus Institute of Advanced Studies, Aarhus University, Høegh-Guldbergs Gade 6B, DK-8000 Aarhus C, Denmark; Center for Complex Quantum Systems, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

  • *yzhuaudipc@zzu.edu.cn
  • cxshan@zzu.edu.cn
  • moelmer@phys.au.dk

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Issue

Vol. 128, Iss. 25 — 24 June 2022

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