Rydberg electromagnetically induced transparency and absorption of strontium triplet states in a weak microwave field

Yan-Li Zhou, Dong Yan, and Weibin Li
Phys. Rev. A 105, 053714 – Published 19 May 2022

Abstract

We study theoretically laser excitation of Rydberg triplet states of strontium atoms in the presence of weak microwave (MW) fields. Starting from the ground state 5s21S0, the Rydberg excitation is realized through the metastable, triplet 5s5p3P1 state, whose decay rate γ2 is 2π×7.5 kHz, much smaller than the one in the singlet state or alkali-metal atoms. The influences of γ2 on the transparency and absorption spectrum in the electromagnetically induced transparency (EIT), and electromagnetically induced absorption (EIA) regime are examined. Narrow transparent windows (EIT) or absorption peaks (EIA) are found, whose distance in the spectrum depends on the Rabi frequency of the weak MW field. It is found that the spectrum exhibits higher contrast than using the singlet state or alkali-metal atoms in typical situations. Using the metastable intermediate state, we find that the resonance fluorescence of Sr gases exhibits very narrow peaks, which are modulated by the MW field. When the MW field is weaker than the probe and control light, the spectrum distance of these peaks is linearly proportional to Ωm. This allows us to propose an alternative way to sense very weak MW fields through resonance fluorescence. Our study shows that the Sr triplet state could be used to develop the Rydberg MW electrometry that gains unique advantages.

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  • Received 29 January 2022
  • Accepted 9 May 2022

DOI:https://doi.org/10.1103/PhysRevA.105.053714

©2022 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Yan-Li Zhou1,*, Dong Yan2, and Weibin Li3,†

  • 1Department of Physics, College of Liberal Arts and Sciences, and Interdisciplinary Center for Quantum Information, National University of Defense Technology, Changsha 410073, China
  • 2School of Science and Key Laboratory of Materials Design and Quantum Simulation, Changchun University, Changchun 130022, China
  • 3School of Physics and Astronomy, and Centre for the Mathematics and Theoretical Physics of Quantum Non-equilibrium Systems, University of Nottingham, Nottingham NG7 2RD, United Kingdom

  • *ylzhou@nudt.edu.cn
  • weibin.li@nottingham.ac.uk

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Issue

Vol. 105, Iss. 5 — May 2022

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