Measuring the Entanglement between Double Quantum Dot Charge Qubits

TL;DR

This paper proposes a method to generate and detect entanglement between two double quantum dot charge qubits using current correlation measurements and Bell inequality tests, leveraging internal qubit dynamics.

Contribution

It introduces a novel scheme combining voltage pulse control and internal qubit dynamics for entanglement creation and measurement in quantum dot systems.

Findings

Successful construction of Bell inequality using current correlations

Demonstration of entanglement detection via transport measurements

Utilization of internal qubit dynamics for single-particle rotations

Abstract

We present a scheme for creating and measuring entanglement between two double quantum dot charge qubits in a transport set-up in which voltage pulses can modify system parameters. Detection of entanglement is performed via the construction of a Bell inequality with current correlation measurements. An essential feature is the use of the internal dynamics of the qubits as the constituent electrons tunnel into the leads to give the single-particle rotations necessary for the Bell measurement.