Electric-Field Control of Photon Indistinguishability in Cascaded Decays in Quantum Dots

Photon indistinguishability, entanglement, and antibunching are key ingredients in quantum optics and photonics. Decay cascades in quantum emitters offer a simple method to create entangled-photon-pairs with negligible multipair generation probability. However, the degree of indistinguishability of the photons emitted in a cascade is intrinsically limited by the lifetime ratio of the involved transitions. Here we show that, for the biexciton-exciton cascade in a quantum dot, this ratio can be widely tuned by an applied electric field. Hong-Ou-Mandel interference measurements of two subsequently emitted biexciton photons show that their indistinguishability increases with increasing field, following the theoretically predicted behavior. At the same time, the emission line width stays close to the transform-limit, favoring applications relying on the interference among photons emitted by different sources.

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Publication Details

Journal
Nano Letters
Published
2025-04-18
DOI
https://doi.org/10.1021/acs.nanolett.5c01354
Citations
8
Primary Topic
Quantum Information and Cryptography
Type
article
Field-Weighted Citation Impact
19.85

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article

Electric-Field Control of Photon Indistinguishability in Cascaded Decays in Quantum Dots

Armando Rastelli, S. Mader, Johannes Reindl, Santanu Manna et al.
8 citations
Nano Letters
Quantum Information and Cryptography
19.85
article

Electric-Field Control of Photon Indistinguishability in Cascaded Decays in Quantum Dots

Armando Rastelli, S. Mader, Johannes Reindl, Santanu Manna, Saimon Filipe Covre da Silva, Gabriel Undeutsch, Eva Schöll, Ailton J. Garcia, Christian Weidinger, Maximilian Aigner, Μ. Peter
article en
8 citations

Abstract

Photon indistinguishability, entanglement, and antibunching are key ingredients in quantum optics and photonics. Decay cascades in quantum emitters offer a simple method to create entangled-photon-pairs with negligible multipair generation probability. However, the degree of indistinguishability of the photons emitted in a cascade is intrinsically limited by the lifetime ratio of the involved transitions. Here we show that, for the biexciton-exciton cascade in a quantum dot, this ratio can be widely tuned by an applied electric field. Hong-Ou-Mandel interference measurements of two subsequently emitted biexciton photons show that their indistinguishability increases with increasing field, following the theoretically predicted behavior. At the same time, the emission line width stays close to the transform-limit, favoring applications relying on the interference among photons emitted by different sources.

Nano LettersVol. 25(17)
Johannes Kepler University of Linz (AT), Universidade Estadual de Campinas (UNICAMP) (BR), Fraunhofer Institute for Integrated Circuits (DE), Indian Institute of Technology Delhi (IN)
Austrian Science Fund, Österreichische Forschungsförderungsgesellschaft, Fundação Amazônia Paraense de Amparo à Pesquisa, H2020 Future and Emerging Technologies, H2020 Research Infrastructures, HORIZON EUROPE European Innovation Council
Openalex Percentile: Top 1%
Quantum Information and Cryptography
19.85
DOIOpen Access PDFOpenAlex
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