Current induced entanglement of nuclear spins in quantum dots

TL;DR

This paper introduces a mechanism where electric current induces entanglement among nuclear spins in quantum dots, significantly affecting electron spin relaxation and measurable via leakage current, offering a new approach to quantum spin control.

Contribution

It presents a novel entanglement mechanism driven by electric current in quantum dots, distinct from optical methods, with implications for quantum information processing.

Findings

Entangled nuclear spins increase electron spin relaxation rates.

Leakage current measurements can detect nuclear spin entanglement.

The mechanism is specific to current-driven processes, not optical experiments.

Abstract

We propose an entanglement mechanism of nuclear spins in quantum dots driven by the electric current. The current accompanied by the spin flip in quantum dots gradually increases components of larger total spin of nuclei. This entangled state drastically enhances the spin relaxation rate of electrons, which can be detected by measuring a leakage current in the spin-blockade region. This mechanism is not relevant in optical experiments which examine the spin relaxation of single excitations.