Implementation Of Many-Particles Entanglement State And Quantum Cloning Based On Singly Charged Quantum Dots In Cavity Quantum Electrodunamics

Solid state system is one of the most promising physical systems for realizing quantum information processing, so the research in quantum dot(QD) system of quantum information processing has become the hot topic in recent years. In this dissertation the implementations’ quantum logic gates, multi-particle entanglement and quantum cloning are proposed based on QD-cavity coupling system. The main research contents as follows:(1)We propose the schemes of implement quantum gates and multi-particle entanglement in weak coupling and strong coupling regimes. Even if consider the influence of cavity decay, frequency detuning and cavity leakage, the fidelities of these schemes can also approach to unit.(2)Based on the weak coupling interaction between QD and optical cavity, the conditional phase gate between the electronic and photonic is constructed. Using the proposed conditions phase gate, we propose the implementions for quantum telepor-tation between remote QD-cavity, bell state analyzer and multi-particle GHZ state analyzer, also this analyzer can be used for preparing multi-particle entanglement. The high fidelities and success probabilities can be obtained in all these schemes Furthermore, we discussed the feasibility of the scheme in experiment.(3)We investigate quantum cloning using quantum dot-cavity, and the1â†'2symmetric universal,1â†'2phase-covariant, and1â†'3economical phase-covariant quantum cloning machines are constructed. Using the interaction between two three-level electrons and cavities with the help of an uniform magnetic field, we realized three types of local cloning. Also we can obtain high fidelity by choosing the different magnetic strength.The above works deepen and enrich the reseaches on quantum information pro-cessing in hybrid quantum information system, it provides the reference for quantum information processing solid-state QD system.