Absence of collapse in quantum Rabi oscillations

Shu He, Yang Zhao, and Qing-Hu Chen
Phys. Rev. A 90, 053848 – Published 26 November 2014

Abstract

We show analytically that the collapse and revival in the population dynamics of the atom-cavity coupled system under the rotating wave approximation (RWA), valid only at very weak coupling, is an artifact as the atom-cavity coupling is increased. Even the first-order correction to the RWA is able to bring about the absence of the collapse in the dynamics of atomic population inversion thanks to intrinsic oscillations resulting from the transitions between two levels with the same atomic quantum number. The removal of the collapse is valid for a wide range of coupling strengths which are accessible to current experimental setups. In addition, based on our analytical results that greatly improve upon the conventional RWA, even the strong-coupling power spectrum can now be explained with the help of the numerically exact energy levels.

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  • Received 3 April 2014

DOI:https://doi.org/10.1103/PhysRevA.90.053848

©2014 American Physical Society

Authors & Affiliations

Shu He1,2, Yang Zhao3, and Qing-Hu Chen1,2,*

  • 1Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China
  • 2Center for Statistical and Theoretical Condensed Matter Physics, Zhejiang Normal University, Jinhua 321004, People's Republic of China
  • 3Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798

  • *qhchen@zju.edu.cn

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Vol. 90, Iss. 5 — November 2014

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