Optical remote control of a charge qubit

TL;DR

This paper demonstrates an optical method to control and read out charge qubits in double quantum dots, showing that entanglement can be achieved despite decoherence, advancing quantum technology integration.

Contribution

It introduces a reliable optical coupling technique between electron transport qubits and photonic sources, enabling control and entanglement in quantum dot systems.

Findings

Optical excitation can control charge qubit populations.

Entanglement between electron and photonic qubits is achievable.

Decoherence does not prevent entanglement in the proposed system.

Abstract

Both the electron transport-based qubits, implemented through double quantum dots, and the sources of indistinguishable single-photons like self-assembled quantum dots are strong candidates for the implementation of quantum technologies, such as quantum computers and quantum repeaters. Here, we demonstrate a reliable way of coupling these two types of qubits, uncovering the possibility of controlling and reading out the population of the double quantum dot via optical excitation. It is also showed that, in spite of the decoherence mechanisms affecting the qubits, the entanglement between them is achievable and, consequently, the implementation of the suggested system in quantum technologies is feasible.