Preparation And Reconstruction Of Quantum States, And Slow Light Effects In Quantum Dots

This dissertation is concerned with two research fields. The first part involves reconstruction of the two-mode Wigner function of quantum state, the maximum entangled state of two atoms, the entangled coherent state of cavity fields, the maximum entangled state of two excitons and the W state of three excitons. The second part involves voltage controlled slow light effects in asymmetry double quantum dots (QDs). The main results of this dissertation are as follows:1.The state vector or its representations cannot be measured directly. Therefore, it is desirable to reconstruct them from measurable quantities. We suggest a scheme for reconstructing the Wigner function of two-mode fields. We find that there is a simple relation between the Wigner function of the cavity fields and the atomic populations. One can obtain the Wigner function by measuring the atomic populations with a micromaser-like experiment and doing a numerical integral.2.The preparation of entangled states is one of the important research subjects in quantum information science. It can be used...