Generation and detection of a spin entanglement in nonequilibrium quantum dots

TL;DR

This paper demonstrates how spin entanglement can be generated and detected in nonequilibrium quantum dots, revealing unique quantum interference effects and proposing a multi-terminal setup for experimental realization.

Contribution

It introduces a novel multi-terminal setup for generating and detecting spin entanglement in quantum dots, highlighting the role of Aharonov-Bohm oscillation cancellation.

Findings

Entangled two-electron Werner states form with imbalance in singlet/triplet probabilities.

A specific regime where spin entanglement cancels Aharonov-Bohm oscillations.

Proposed experimental setup for entanglement detection in quantum dots.

Abstract

Spin entanglement between two spatially separated electrons can be generated in nonequilibrium interacting quantum dots, coherently coupled to a common lead. In this system entangled two-electron states develop which are Werner states with an imbalance between singlet and triplet probabilities. We propose a multi-terminal, multiply-connected setup for the generation and detection of this imbalance. In particular, we identify a regime in which the formation of spin entanglement leads to a cancellation of Aharonov-Bohm oscillations.