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

TL;DR

This paper investigates how hyperfine interactions with nuclear spins affect the fidelity of deterministic electron spin teleportation in quantum dots, showing that high-fidelity teleportation is feasible under certain conditions, supporting quantum computing prospects.

Contribution

The study analyzes the impact of nuclear spin bath-induced decoherence on a proposed electron spin teleportation protocol in quantum dots, identifying conditions for successful high-fidelity teleportation.

Findings

Nonclassical teleportation fidelity achievable with proper conditions

Decoherence effects can be mitigated to enable quantum computation

Quantum dot teleportation remains promising despite hyperfine interactions

Abstract

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.