Gate-based protocol simulations for quantum repeaters using quantum-dot molecules in switchable electric fields

TL;DR

This paper models the dynamics of electrically controlled quantum-dot molecules for quantum repeaters, providing insights into entangled state preparation speed and fidelity under realistic conditions.

Contribution

It introduces a microscopic open-quantum-systems approach to simulate entanglement generation in QDMs with electric control and dissipation effects.

Findings

Quantifies transition between adiabatic and non-adiabatic regimes.

Provides maximum entangled-state preparation speed estimates.

Enables realistic device simulations for quantum repeater protocols.

Abstract

Electrically controllable quantum-dot molecules (QDMs) are a promising platform for deterministic entanglement generation and, as such, a resource for quantum-repeater networks. We develop a microscopic open-quantum-systems approach based on a time-dependent Bloch-Redfield equation to model the generation of entangled spin states with high fidelity. The state preparation is a crucial step in a protocol for deterministic entangled-photon-pair generation that we propose for quantum repeater applications. Our theory takes into account the quantum-dot molecules' electronic properties that are controlled by time-dependent electric fields as well as dissipation due to electron-phonon interaction. We quantify the transition between adiabatic and non-adiabatic regimes, which provides insights into the dynamics of adiabatic control of QDM charge states in the presence of dissipative processes. From this, we infer the maximum speed of entangled-state preparation under different experimental conditions, which serves as a first step towards simulation of attainable entangled photon-pair generation rates. The developed formalism opens the possibility for device-realistic descriptions of repeater protocol implementations.