Volume 56, Number 5, December 2001
|Page(s)||665 - 671|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 December 2003|
Inhibition of cooperative quantum jumps due to fast spontaneous decay
Max-Planck-Institut für Quantenoptik and Sektion Physik der LMU München
Hans-Kopfermann-Str. 1, D-85748 Garching, Germany
2 Institut für Theoretische Physik, Universität Regensburg D-93040 Regensburg, Germany
3 Physical Research Laboratory - Navrangpura, Ahmedabad-380 009, India
Accepted: 14 September 2001
A Quantum Monte Carlo wave function approach is used to rule out the possibility of cooperative effects in the quantum jump statistics of adjacent three-level ions of the type discussed in a series of experiments and theoretical investigations. By deriving analytical results and examining quantum jumps in various subspaces, we track this outcome to the fact that a fast spontaneous decay inhibits dipole-dipole-induced entanglement between the ions developing on a much slower time scale. This inhibition is demonstrated even for weak pumping of the fast transition. The Quantum Monte Carlo calculation thus sheds new light on the controversy arising from the findings of two recent conflicting experiments by Block et al. (Eur. Phys. J. D, 7 (1999) 461) and Donald et al. (Europhys. Lett., 51 (2000) 388).
PACS: 42.50.Fx – Cooperative phenomena; superradiance and superfluorescence / 42.50.Lc – Quantum fluctuations, quantum noise, and quantum jumps / 32.80.Pj – Optical cooling of atoms; trapping
© EDP Sciences, 2001
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