Energy-time entanglement from a resonantly driven quantum-dot three-level system

Entanglement is a major resource in advanced quantum technology where it can enable a secure exchange of information over large distances. Energy-time entanglement is particularly attractive for its beneficial robustness in fiber-based quantum communication and can be demonstrated in the Franson int...

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Bibliographic Details
Main Authors: M. Hohn, K. Barkemeyer, M. von Helversen, L. Bremer, M. Gschrey, J.-H. Schulze, A. Strittmatter, A. Carmele, S. Rodt, S. Bounouar, S. Reitzenstein
Format: Article
Language:English
Published: American Physical Society 2023-06-01
Series:Physical Review Research
Online Access:http://doi.org/10.1103/PhysRevResearch.5.L022060
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Summary:Entanglement is a major resource in advanced quantum technology where it can enable a secure exchange of information over large distances. Energy-time entanglement is particularly attractive for its beneficial robustness in fiber-based quantum communication and can be demonstrated in the Franson interferometer. We report on Franson-type interference from a resonantly driven biexciton cascade under continuous wave excitation. Our measurements yield a maximum visibility of (73±2)% surpassing the limit of violation of Bell's inequality (70.7%) by more than one standard deviation. Despite being unable to satisfy a loophole free violation, our work demonstrates promising results concerning future studies on such a system. Furthermore, our systematical investigations on the impact of driving strength indicate that dephasing mechanisms and deviations from the cascaded emission have a major impact on the degree of the measured energy-time entanglement.
ISSN:2643-1564