Gate-based protocol simulations for quantum repeaters using quantum-dot molecules in switchable electric fields
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866914665525673984 |
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| author | Wilksen, Steffen Lohof, Frederik Willmann, Isabell Bopp, Frederik Lienhart, Michelle Thalacker, Christopher Finley, Jonathan Florian, Matthias Gies, Christopher |
| author_facet | Wilksen, Steffen Lohof, Frederik Willmann, Isabell Bopp, Frederik Lienhart, Michelle Thalacker, Christopher Finley, Jonathan Florian, Matthias Gies, Christopher |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_14563 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Gate-based protocol simulations for quantum repeaters using quantum-dot molecules in switchable electric fields Wilksen, Steffen Lohof, Frederik Willmann, Isabell Bopp, Frederik Lienhart, Michelle Thalacker, Christopher Finley, Jonathan Florian, Matthias Gies, Christopher Quantum Physics Mesoscale and Nanoscale Physics 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. |
| title | Gate-based protocol simulations for quantum repeaters using quantum-dot molecules in switchable electric fields |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2308.14563 |