Generationofmulti-Photongreenberger-Horne- Zeilingerstatesandclusterstatesthrougha Quantum-Dotspininopticalmicrocavity

Quantum entanglement plays an important role in the fields of quantum com-putation and quantum communication. It provides a necessary resource for quantum information and has received much attention. Compared with the two-party entan-gled state, the multi-party entangled state can reflect the nonlocality of quantum mechanics more clearly to some extent. Recently, lots of schemes have been pro-posed to generate entangled states. In these schemes, quantum dot (QD) system is one of the ideal physical system which is the most likely to realize quantum in-formation processing. A lot of researchers have paid their attentions to the study of quantum dot system associated with quantum information tasks. So the gener-ation of multi-photon entangled state via quantum-dot in optical microcavity has important significance in the quantum information field.In this dissertation, we propose two schemes to generate multi-photon Greenberger-Horne-Zeilinger states and cluster states via a quantum-dot spin in a double-sided optical microcavity. With spin measurement and local Hadamard operations, these entangled states could be determinately generated. The fidelities of our schemes are quite high under the actual conditions. The results of analysis indicate that the schemes can be implemented in both Purcell regime and strong coupling regime under the current technology.