Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

Q 30.72: Poster

Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais

Quantum interference and spontaneous decay — •Andreas Alexander Buchheit and Giovanna Morigi — Universität des Saarlandes, Saarbrücken, Deutschland

We consider a three level transition, composed by two excited states which couple to a common ground state by means of two optical dipole transitions. We first consider that the levels are arranged in a so-called cascade configuration and determine the condition on the decay rate of the intermediate state and on the strength of the pumping field for which coherent-population trapping is observed. We then consider a V-type of transition, where the dipole transitions coupling with the common ground state are parallel. This configuration has been discussed in [1] and is expected to exhibit interference in the spontaneous decay due to cross-damping terms in the master equation. We present a detailed derivation of the master equation and analyze the conditions under which this effect could be experimentally measured in the setup of [2].

[1]: Z. Ficek and S. Swain, Quantum interference and coherence: theory and experiments (Springer, Berlin, 2005) [2]: A. Beyer et al, Ann. Phys., 525: 671-679