Wavevector-resolved polarization entanglement from radiative cascades

Alessandro Laneve (), Michele B. Rota, Francesco Basso Basset, Mattia Beccaceci, Valerio Villari, Thomas Oberleitner, Yorick Reum, Tobias M. Krieger, Quirin Buchinger, Rohit Prasad, Saimon F. Covre Silva, Andreas Pfenning, Sandra Stroj, Sven Höfling, Armando Rastelli, Tobias Huber-Loyola and Rinaldo Trotta ()
Additional contact information
Alessandro Laneve: Sapienza Università di Roma
Michele B. Rota: Sapienza Università di Roma
Francesco Basso Basset: Sapienza Università di Roma
Mattia Beccaceci: Sapienza Università di Roma
Valerio Villari: Sapienza Università di Roma
Thomas Oberleitner: Johannes Kepler University
Yorick Reum: University of Würzburg
Tobias M. Krieger: Johannes Kepler University
Quirin Buchinger: University of Würzburg
Rohit Prasad: University of Würzburg
Saimon F. Covre Silva: Johannes Kepler University
Andreas Pfenning: University of Würzburg
Sandra Stroj: Forschungszentrum Mikrotechnik
Sven Höfling: University of Würzburg
Armando Rastelli: Johannes Kepler University
Tobias Huber-Loyola: University of Würzburg
Rinaldo Trotta: Sapienza Università di Roma

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract The generation of entangled photons from radiative cascades has enabled milestone experiments in quantum information science with several applications in photonic quantum technologies. Significant efforts are being devoted to pushing the performances of near-deterministic entangled-photon sources based on single quantum emitters often embedded in photonic cavities, so to boost the flux of photon pairs. The general postulate is that the emitter generates photons in a nearly maximally entangled state of polarization, ready for application purposes. Here, we demonstrate that this assumption is unjustified. We show that in radiative cascades there exists an interplay between photon polarization and emission wavevector, which can be further amplified by embedding the emitters in micro-cavities. We discuss how the polarization entanglement of photon pairs from a biexciton-exciton cascade in quantum dots strongly depends on their propagation wavevector and we even observe entanglement vanishing for large emission angles. Our experimental results, backed by theoretical modeling, yield a brand-new understanding of cascaded emission for various quantum emitters. In addition, our model provides quantitative guidelines for designing optical microcavities that retain both a high degree of entanglement and collection efficiency, moving the community one step further towards an ideal source of entangled photons for quantum technologies.

Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-025-61460-3 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-61460-3

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-025-61460-3

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().