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  • Letter
  • Open Access

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

M. Hohn1, K. Barkemeyer2, M. von Helversen1, L. Bremer1, M. Gschrey1, J.-H. Schulze1, A. Strittmatter1,*, A. Carmele2, S. Rodt1 et al.

S. Bounouar1 and S. Reitzenstein1

  • 1Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany
  • 2Institut für Theoretische Physik, Technische Universität Berlin, 10623 Berlin, Germany

  • *Present address: Institute of Physics, Otto-von-Guericke-University Magdeburg, 39106 Magdeburg, Germany.
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Phys. Rev. Research 5, L022060 – Published 22 June, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022060

Abstract

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.

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Phys. Rev. Research 5, L022060– Published 22 June, 2023
  • Received 16 January 2023
  • Accepted 19 May 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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