Electrostatic control of quantum dot entanglement induced by coupling to external reservoirs

TL;DR

This paper proposes a quantum transport experiment using three quantum dots to generate and detect charge entanglement, controllable via gate potentials, with potential applications in quantum information processing.

Contribution

It introduces a novel method for entangling quantum dots through electrostatic control and reservoir coupling, inspired by cavity quantum electrodynamics techniques.

Findings

High degree of charge entanglement achieved

Entanglement controllable with gate potential

Current measurement enables state detection

Abstract

We propose a quantum transport experiment to prepare and measure charge-entanglement between two electrostatically defined quantum dots. Coherent population trapping, as realized in cavity quantum electrodynamics, can be carried out by using a third quantum dot to play the role of the optical cavity. In our proposal, a pumping which is quantum mechanically indistinguishable for the quantum dots drives the system into a state with a high degree of entanglement. The whole effect can be switched on and off by means of a gate potential allowing both state preparation and entanglement detection by simply measuring the total current.