Affiliation:
1. Institute for Theoretical Physics and Bremen Center for Computational Material Science University of Bremen Otto‐Hahn‐Allee 1 28359 Bremen Germany
2. Walter Schottky Institut School of Natural Sciences, and MCQST Technische Universität München Am Coulombwall 4 85748 Garching Germany
3. Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 USA
Abstract
AbstractElectrically controllable quantum‐dot molecules (QDMs) are a promising platform for deterministic entanglement generation and, as such, a resource for quantum‐repeater networks. A microscopic open‐quantum‐systems approach based on a time‐dependent Bloch–Redfield equation is developed 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 is proposed for quantum repeater applications. The 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. The transition between adiabatic and non‐adiabatic regimes is quantified, which provides insights into the dynamics of adiabatic control of QDM charge states in the presence of dissipative processes. From this, the maximum speed of entangled‐state preparation is inferred under different experimental conditions, which serves as a first step toward simulation of attainable entangled photon‐pair generation rates. The developed formalism opens the possibility for device‐realistic descriptions of repeater protocol implementations.
Funder
Key Laboratory of Engineering Dielectrics and Its Application (Harbin University of Science and Technology), Ministry of Education
Alexander von Humboldt-Stiftung
Subject
Electrical and Electronic Engineering,Computational Theory and Mathematics,Condensed Matter Physics,Mathematical Physics,Nuclear and High Energy Physics,Electronic, Optical and Magnetic Materials,Statistical and Nonlinear Physics