Quantum Entanglement and Quantum Control of Single Semiconductor Quantum Dots
CHANG WEN HAO
Semiconductor quantum dots (QDs) have been considered as nearly ideal two-level systems and proven to be very promising for applications in quantum information science and quantum computations, such as using single QDs as quantum light sources or as solid-state quantum bits. In this project, following the two main themes of QD-based quantum light sources and solid-state quantum bits, we propose to study the quantum entanglements of the emitted photon pairs and quantum coherent controls of exciton states for quantum gate operations. The targets include: (1) The control of exciton fine-structure splitting and the generation of entangled photon pairs; (2) Highly efficient QD-based entangled photon sources; (3) The detection and control of quantum phase evolutions of exciton states in QDs; (4) Electromagnetically induced transparency in single QDs; (5) Magneto-optical Kerr effect of single spin in single QDs. We will establish the detection and analysis methods for the emitted entangled photons. We will design and fabricate suitable coupled microcavities with embedded QDs for generating efficient entangled photon pairs. In addition, the detection and control of quantum phase evolutions of exciton states in QDs will be studied. By controlling the exciton fine-structure splitting, the control of polarization states of single photons can be realized by mediating single QDs. We will also try to implement the electromagnetically induced transparency effect in QD systems, and by which to study the phenomena of slow light and its nonlinear optical properties. We intend to establish the technique of detecting single spins in single QDs based on the magneto-optical Kerr effect for the study of controlling single spin state in solid state environments.
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