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Updated: Sep 16, 2025

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Wavevector-resolved polarization entanglement from radiative cascades.

Alessandro Laneve1, Michele B Rota2, Francesco Basso Basset2,3

  • 1Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, Roma, Italy. alessandro.laneve@uniroma1.it.

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|July 5, 2025
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Summary
This summary is machine-generated.

Entangled photon sources for quantum technologies are not always maximally entangled. Photon polarization and emission direction interact, impacting entanglement, especially in micro-cavities. This finding aids in designing better entangled photon sources.

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Area of Science:

  • Quantum Information Science
  • Photonic Quantum Technologies

Background:

  • Entangled photons from radiative cascades are crucial for quantum information science and photonic quantum technologies.
  • Current efforts focus on enhancing entangled-photon sources using single quantum emitters in photonic cavities to increase photon pair flux.
  • A common assumption is that emitters generate nearly maximally entangled photon polarization states.

Purpose of the Study:

  • To challenge the assumption of maximally entangled photon states from radiative cascades.
  • To investigate the interplay between photon polarization and emission wavevector in entangled photon generation.
  • To provide guidelines for optimizing entangled photon sources in quantum technologies.

Main Methods:

  • Experimental investigation of polarization entanglement in biexciton-exciton cascades in quantum dots.
  • Theoretical modeling of the emission process, considering the influence of micro-cavities.
  • Analysis of entanglement dependence on photon propagation wavevector and emission angles.

Main Results:

  • Demonstrated that photon polarization and emission wavevector are interdependent in radiative cascades.
  • Showed that this interplay is amplified by micro-cavities.
  • Observed vanishing entanglement at large emission angles, contradicting previous assumptions.

Conclusions:

  • The assumption of maximally entangled photon polarization from radiative cascades is unjustified.
  • Understanding the wavevector-polarization interplay is essential for optimizing entangled photon sources.
  • The developed model offers quantitative guidance for designing improved micro-cavities for high-quality entangled photon generation.