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arXiv · 2308.14563

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

Steffen Wilksen·Frederik Lohof·Isabell Willmann·Frederik Bopp·Michelle Lienhart·Christopher Thalacker·Jonathan Finley·Matthias Florian·Christopher Gies
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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.

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Steffen Wilksen, Frederik Lohof, Isabell Willmann, Frederik Bopp, Michelle Lienhart, Christopher Thalacker, Jonathan Finley, Matthias Florian, Christopher Gies. 2023-08-28. Gate-based protocol simulations for quantum repeaters using quantum-dot molecules in switchable electric fields. https://doi.org/10.1002/qute.202300280

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