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説明:

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.

権利情報:

• In Copyright
  ©2013 American Physical Society

キーワード: GaAs, Quantum Dot, Droplet Epitaxy, Entanglement, (111)A, Fine Structure Splitting, Bell’s inequality

刊行年月日: 2013-07-18

出版者: American Physical Society (APS)

掲載誌:

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

研究助成金:

• 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))

原稿種別: 著者最終稿 (Accepted manuscript)

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

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

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更新時刻: 2025-12-09 16:31:05 +0900

MDRでの公開時刻: 2025-12-09 16:26:09 +0900