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  • Open Access

Entangled photons from quantum-dot–cavity systems under non-Markovian decoherence by pulsed excitation

Katy Snow1,* and Mauro Paternostro1,2

  • *Contact author: ksnow01@qub.ac.uk
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Phys. Rev. B 114, 185301 – Published 9 September, 2026

DOI: https://doi.org/10.1103/g8t7-my5q

Abstract

Cascaded emission from the biexciton state of a quantum dot results in polarization entangled photon pairs. Cavity enhancement of the direct two-photon emission channel bypasses the dominant source of decoherence in this system, namely the fine-structure splitting of the exciton levels. Here, we investigate the remaining non-Markovian phonon-induced decoherence using the numerically exact uniTEMPO algorithm. We compute the degree of entanglement of photon pairs generated by pulsed two-photon resonant excitation and find surprisingly good agreement between the numerically exact results and those calculated using the approximate polaron master equation method, permitting an efficient exploration of trends across system parameters.

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Phys. Rev. B 114, 185301– Published 9 September, 2026
  • Received 30 March 2026
  • Revised 10 July 2026
  • Accepted 12 August 2026
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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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