Cooper pair splitting efficiency in the hybrid three-terminal quantum dot

TL;DR

This paper investigates a three-terminal quantum dot device that efficiently splits Cooper pairs into entangled electrons, achieving up to 80% efficiency, with tunability via electric control.

Contribution

It provides a theoretical analysis demonstrating high tunable efficiency of Cooper pair splitting in a hybrid quantum dot device.

Findings

Splitting efficiency can reach up to 80%.

Efficiency is tunable by electric means.

Device effectively produces entangled electrons.

Abstract

Nanodevices consisting of a quantum dot tunnel coupled to one superconducting and two normal electrodes may serve as a source of entangled electrons. As a result of crossed Andreev reflection the Cooper pair of s-wave character may be split into two electrons and each of them goes into a distinct normal electrode, preserving entanglement. Efficiency of the process depends on the specific system and is tunable by electric means. Our calculations show that in the studied device this efficiency may attain values as large as $80 \%$.