Quantum Dynamics Behaviors in Quantum Dot-Metal Nanoring Hybrid System

The hybrid structure composed of quantum dot and metal nanoring was widely used in quantum devices and quantum informatin processing. The quantum dynamics of the quantum dots-metal nanoring system was investigated by solving the Schrodinger equation. The analytical expressions of the populations of the quantum dots and the mental surface plasmons under different initial conditions were deduced, and the influences of decay on the generation of entangled states and quantum state transfer were investigated. The results show that when one of the quantum dots is excited, the maximum entangled state between the two quantum dots can be realized by reasonably designing the coupling coefficient between the quantum dots and nanoring, and the surface plasmon is not excited, and the transfer between the quantum states can also be realized. When one of the modes of surface plasmon is excited but the quantum dots stay in vacuum states, the maximum entangled state of the surface plasmon mode can be achieved, but the maximum entangled state between qantum dots can not be achieved.When the decay coefficient increases to 0.2 times of the coupling coefficient, the reliability of the maximum entanglement and quantum state transfer can still remain above 0.92.