Generation of entangled channels for perfect teleportation using multielectron quantum dots

Abstract

We propose a scheme for generating $N$-qubit entangled states which can teleport an unknown state perfectly. By switching on the exchange interaction $(J)$ between the qubits one can get the desired states periodically. A multielectron quantum dot can be a possible realization for generating such $N$-qubit states with high fidelity. It is shown that, in the limit of $N\ensuremath{\rightarrow}\ensuremath{\infty}$, there exists a unique time $t=\frac{2}{3J}{\mathrm{cos}}^{\ensuremath{-}1}(\ensuremath{-}1∕8)$, where the Hamiltonian dynamics gives the $N$-qubit state that can carry out perfect teleportation. We also discussed the effect of the nuclear spin environment on the entanglement of the $N$-qubit teleportation channels.