Journal of Statistical Physics

, Volume 33, Issue 1, pp 223–229 | Cite as

Spontaneous emission of a two-level system and the influence of the rotating-wave approximation on the final state. I



By using a modified Robertson projection technique an exact equation of motion for the expectation value of the population inversion operatorS z of a single two-level atom in the case of spontaneous emission is derived. Afterwards, by making the Markov approximation, it is shown that the ground state expectation value〈S z t =− 1/2 fort→∞ will be reached only if the rotating-wave approximation or the Born approximation is made additionally.

Key words

Quantum statistical mechanics of open systems spontaneous emission two-level atom modified Robertson projection technique Markov approximation rotating-wave approximation 


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Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • J. Seke
    • 1
  1. 1.Institut für Theoretische PhysikTechnische UniversitÄt WienViennaAustria

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