Optimal electron entangler and single electron source at low temperatures

TL;DR

This paper demonstrates how to suppress equilibrium noise in mesoscopic tunnel junctions with modulated transparency, enabling optimal electron entangling and single-electron sources at low temperatures.

Contribution

It introduces an optimal protocol for modulating tunnel junction transparency to minimize equilibrium noise, advancing electron source technology.

Findings

Equilibrium noise can be significantly suppressed with proper modulation.

The protocol enables efficient electron entanglement and single-electron emission.

Suppressed noise improves performance of quantum electronic devices.

Abstract

Electron transport in mesoscopic contacts at low temperatures is accompanied by logarithmically divergent equilibrium noise. We show that this equilibrium noise can be dramatically suppressed in the case of a tunnel junction with modulated (time-dependent) transparency, and identify the optimal protocol. We show how such a contact could be used either as an optimal electron entangler or as a single-electron source with suppressed equilibrium noise at low temperatures.