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Hidden anisotropy controls spin-photon entanglement in a charged quantum dot

Yuriy Serov*, Aidar Galimov, Dmitry S. Smirnov†, Maxim Rakhlin, Nikita Leppenen, Grigorii Klimko, Sergey Sorokin, Irina Sedova, Daria Berezina et al.

Yuliya Salii, Marina Kulagina, Yuriy Zadiranov, Sergey Troshkov, Tatiana V. Shubina, and Alexey A. Toropov

  • *Contact author: serovjurij@beam.ioffe.ru
  • †Contact author: smirnov@mail.ioffe.ru
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Phys. Rev. Applied 23, 044019 – Published 8 April, 2025

DOI: https://doi.org/10.1103/PhysRevApplied.23.044019

Abstract

Photon entanglement is indispensable for optical quantum technologies. Measurement-based optical quantum computing and all-optical quantum networks rely on multiphoton cluster states consisting of indistinguishable entangled photons. A promising method for creating such cluster states on demand is spin-photon entanglement using the spin of a resident charge carrier in a quantum dot, precessing in a weak external magnetic field. In this work, we show theoretically and experimentally that spin-photon entanglement is strongly affected by the hidden anisotropy of quantum dots, which can arise from mechanical stress, shape anisotropy and even specific crystal structure. In the measurements of time-resolved photoluminescence and the cross-polarized second-order photon correlation function in a magnetic field, the anisotropy manifests itself in the spin dynamics and, as a consequence, in the spin-photon concurrence. The measured time-filtered spin-photon Bell state fidelity depends strongly on the excitation polarization and reaches an extremely high value of 94% at maximum. We specify the magnetic field and excitation polarization directions that maximize spin-photon entanglement and thereby enhance the fidelity of multiphoton entangled states.

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Phys. Rev. Applied 23, 044019– Published 8 April, 2025
  • Received 7 October 2024
  • Revised 14 January 2025
  • Accepted 21 February 2025
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