Quantitative aspects of quantum information and entanglement in multi-qubit quantum dots

Full text: In this work we present an approach to look for the existence of maximum entanglement in a system of two identical quantum dots coupled by the Forester process and interacting with a classical laser field. The single- two- and multi-qubit systems are considered. Our approach is not only able to explain the existing treatments but also provides further detailed insights into the coupled dynamics of quantum-dot systems. The result demonstrates that there are two ways of generating maximum entangled states, one is associated with far off-resonance interaction and the other relates to the weak-field limit. The decoherence effect is considered and new features are found. Reference: 1. A.-S. F. Obada and M. Abdel-Aty, Phys. Rev. B 75, 195310 (2007); 2. M. Abdel-Aty, Eur. Phys. J. D 46, 537-543 (2008) (authors)