Chiral mediated entanglement in an Aharanov Bohm ring?

BRUNO RIZZO; LILIANA ARRACHEA; JUAN PABLO PAZ

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

APS

Año: 2012 vol. 85 p. 45442 - 45450

0163-1829

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 ΦB coincides with an integer number of a half flux quantum Φ0/2. 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 Φ and discuss the reliability of this quantity as evidence of entanglement.