Chiral-mediated entanglement in an Aharonov-Bohm ring

TL;DR

This paper investigates how magnetic flux influences orbital entanglement in an Aharonov-Bohm ring, revealing maximum entanglement at specific flux values due to degenerate chiral states and analyzing noise as an entanglement indicator.

Contribution

It demonstrates the role of chiral degeneracies in controlling entanglement in quantum rings and assesses noise as a measure of entanglement reliability.

Findings

Maximum concurrence at half-integer flux quanta.

Degenerate states with opposite chirality cause entanglement behavior.

Noise analysis supports entanglement detection.

Abstract

We study the orbital entanglement in a biased Aharonov-Bohm ring connected in a four-terminal setup. We find that the concurrence achieves a maximum when the magnetic flux B coincides with an integer number of a half flux quantum 0 /2. We show that this behavior is a consequence of the existence of degenerate states of the ring having opposite chirality. We also analyze the behavior of the noise as a function of and discuss the reliability of this quantity as evidence of entanglement.