Hyperfine interaction induced decoherence and deterministic teleportation of electrons in a quantum dot nanostructure

Recently, de Visser and Blaauboer [Phys. Rev. Lett. {bf 96}, 246801 (2006)] proposed the most efficient deterministic teleportation protocol $cal T$ for electron spins in a semiconductor nanostructure consisting of a single and a double quantum dot. However, it is as yet unknown if $cal T$ can be completed before decoherence sets in. In this paper we analyze the detrimental effect of nuclear spin baths, the main source of decoherence, on $cal T$. We show that nonclassical teleportation fidelity can be achieved with $cal T$ provided certain conditions are met. Our study indicates that realization of quantum computation with quantum dots is indeed promising.