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

https://mdr.nims.go.jp/datasets/f2f824a1-df2d-4253-abc0-2d1f493cdc78

## File

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## Id

f2f824a1-df2d-4253-abc0-2d1f493cdc78

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-12-05T04:50:12.481829Z

## Updated at

2025-12-09T07:31:05.835980Z

## Published at

2025-12-09T07:26:09.913735Z

## Doi

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

## First published url

https://doi.org/10.1103/physrevb.88.041306

## Date published

2013-07-18

## Recorded date published

2013-7

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: 'Symmetric quantum dots as efficient sources of highly entangled photons:
    Violation of Bell''s inequality without spectral and temporal filtering'
  title_type: original
  lang: en

## Description

- description: 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.
  description_type: abstract
  lang: en

## Creator

- name: Takashi Kuroda
  role: author
  orcid: https://orcid.org/0000-0001-6445-7673
- name: Takaaki Mano
  role: author
  orcid: https://orcid.org/0000-0002-6955-260X
- name: Neul Ha
  role: author
- name: Hideaki Nakajima
  role: author
- name: Hidekazu Kumano
  role: author
- name: Bernhard Urbaszek
  role: author
- name: Masafumi Jo
  role: author
- name: Marco Abbarchi
  role: author
- name: Yoshiki Sakuma
  role: author
  orcid: https://orcid.org/0000-0001-6804-7217
- name: Kazuaki Sakoda
  role: author
- name: Ikuo Suemune
  role: author
- name: Xavier Marie
  role: author
- name: Thierry Amand
  role: author

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: GaAs
  schema: not_defined
- subject: Quantum Dot
  schema: not_defined
- subject: Droplet Epitaxy
  schema: not_defined
- subject: Entanglement
  schema: not_defined
- subject: "(111)A"
  schema: not_defined
- subject: Fine Structure Splitting
  schema: not_defined
- subject: Bell’s inequality
  schema: not_defined

## Rights

- description: "©2013 American Physical Society"
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Physical Review B
  issn: 1550235X
  volume: '88'
  issue: '4'
  article_number: '041306'

## Conference



## Related item



## Funding

- identifier: '23340090'
  funder_name: 日本学術振興会
  description: "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\r\n基盤研究(B)"
- identifier: '25390011'
  funder_name: 日本学術振興会
  description: "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\r\n基盤研究(C)"

## Instrument



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## Measurement method



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filename: enangle_20130705_postaccept.pdf