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A microscopic theory of LO‐phonon assisted photoluminescence in semiconductors is presented. In order to systematically describe Coulomb and light–matter interaction, a cluster‐expansion scheme is employed. The carrier–phonon coupling is treated non‐perturbatively within the polaron picture. Luminescence equations are derived, which produces phonon sidebands to arbitrary oder. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Microscopic calculations show that CdSe-based semiconductor quantum dots with confined exciton and biexciton states are suitable candidates for Zeno-logic applications. The frequencies of the control and signal fields are chosen to guarantee very high transmission of the individual beams. If both fields are present simultaneously, they are strongly absorbed due to efficient ground-state-to-biexciton transitions. The optical Bloch equations for a three-level quantum-dot model with self-consistent light-matter coupling are solved numerically. The influence of dephasing and/or inhomogeneous dot distributions is analyzed and the conditions for satisfactory device operation are identified.

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