Article Symmetric quantum dots as efficient sources of highly entangled photons: Violation of Bell's inequality without spectral and temporal filtering

Takashi Kuroda SAMURAI ORCID ; Takaaki Mano SAMURAI ORCID ; Neul Ha ; Hideaki Nakajima ; Hidekazu Kumano ; Bernhard Urbaszek ; Masafumi Jo ; Marco Abbarchi ; Yoshiki Sakuma SAMURAI ORCID ; Kazuaki Sakoda ; Ikuo Suemune ; Xavier Marie ; Thierry Amand

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Takashi Kuroda, Takaaki Mano, Neul Ha, Hideaki Nakajima, Hidekazu Kumano, Bernhard Urbaszek, Masafumi Jo, Marco Abbarchi, Yoshiki Sakuma, Kazuaki Sakoda, Ikuo Suemune, Xavier Marie, Thierry Amand. Symmetric quantum dots as efficient sources of highly entangled photons: Violation of Bell's inequality without spectral and temporal filtering. Physical Review B. 2013, 88 (4), 041306. https://doi.org/10.1103/physrevb.88.041306

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(abstract)

An ideal emitter of entangled photon pairs combines the perfect symmetry of an atom with the convenient electrical trigger of light sources based on semiconductor quantum dots. Our source consists of strain-free GaAs dots self-assembled on a triangular symmetric (111)A surface. The emitted photons reveal a fidelity to the Bell state as high as 86(±2)% without postselection. We show a violation of Bell’s inequality by more than five times the standard deviation, a prerequisite to test a quantum cryptography channel for eavesdropping. Due to the strict nonlocal nature the source can be used for real quantum processing without any postprocessing. The remaining decoherence channel of the photon source is ascribed to random charge and nuclear spin fluctuations in and near the dot.

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Keyword: GaAs, Quantum Dot, Droplet Epitaxy, Entanglement, (111)A, Fine Structure Splitting, Bell’s inequality

Date published: 2013-07-18

Publisher: American Physical Society (APS)

Journal:

  • Physical Review B (ISSN: 1550235X) vol. 88 issue. 4 041306

Funding:

  • 日本学術振興会 23340090 (液滴エピタキシーによる高対称量子ドットを用いた電子相関と光子対発生の研究 基盤研究(B))
  • 日本学術振興会 25390011 (液滴エピタキシー法による理想的な量子ドットの自己形成 基盤研究(C))

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5976

First published URL: https://doi.org/10.1103/physrevb.88.041306

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Updated at: 2025-12-09 16:31:05 +0900

Published on MDR: 2025-12-09 16:26:09 +0900

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