Wavevector-resolved polarization entanglement from radiative cascades
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Laneve, Alessandro Rota, Michele B. Basset, Francesco Basso Beccaceci, Mattia Villari, Valerio Oberleitner, Thomas Reum, Yorick Krieger, Tobias M. Buchinger, Quirin da Silva, Saimon F. Covre Pfenning, Andreas Stroj, Sandra Höfling, Sven Rastelli, Armando Huber-Loyola, Tobias Trotta, Rinaldo |
| author_facet | Laneve, Alessandro Rota, Michele B. Basset, Francesco Basso Beccaceci, Mattia Villari, Valerio Oberleitner, Thomas Reum, Yorick Krieger, Tobias M. Buchinger, Quirin da Silva, Saimon F. Covre Pfenning, Andreas Stroj, Sandra Höfling, Sven Rastelli, Armando Huber-Loyola, Tobias Trotta, Rinaldo |
| contents | 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, strongly affecting quantum correlations when emitters are embedded 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 it can even vanish for large emission angles. Our experimental results, backed by theoretical modelling, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_07875 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Wavevector-resolved polarization entanglement from radiative cascades Laneve, Alessandro Rota, Michele B. Basset, Francesco Basso Beccaceci, Mattia Villari, Valerio Oberleitner, Thomas Reum, Yorick Krieger, Tobias M. Buchinger, Quirin da Silva, Saimon F. Covre Pfenning, Andreas Stroj, Sandra Höfling, Sven Rastelli, Armando Huber-Loyola, Tobias Trotta, Rinaldo Quantum Physics Materials Science 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, strongly affecting quantum correlations when emitters are embedded 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 it can even vanish for large emission angles. Our experimental results, backed by theoretical modelling, 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. |
| title | Wavevector-resolved polarization entanglement from radiative cascades |
| topic | Quantum Physics Materials Science |
| url | https://arxiv.org/abs/2409.07875 |