Transport and Noise of Entangled Electrons

TL;DR

This paper explores how entangled electron states affect current noise and phase coherence in mesoscopic transport, providing methods to detect entanglement via noise measurements and phase oscillations.

Contribution

It demonstrates that entanglement can be detected through noise and phase oscillations in mesoscopic transport setups involving double-dot systems.

Findings

Singlet states cause bunching in current noise.

Triplet states cause antibunching in current noise.

Entanglement detection via phase-coherent oscillations.

Abstract

We consider a scattering set-up with an entangler and beam splitter where the current noise exhibits bunching behavior for electronic singlet states and antibunching behavior for triplet states. We show that the entanglement of two electrons in the double-dot can be detected in mesoscopic transport measurements. In the cotunneling regime the singlet and triplet states lead to phase-coherent current contributions of opposite signs and to Aharonov-Bohm and Berry phase oscillations in response to magnetic fields. We analyze the Fermi liquid effects in the transport of entangled electrons.