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

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

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

Kuroda, Takashi; Mano, Takaaki; Ha, Neul et al.

Physical Review B, 2013, 88(4), 041306-1-041306-5

Permalink : https://hdl.handle.net/2115/59632

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アクセス権	open access
URI	https://hdl.handle.net/2115/59632
タイトル	Symmetric quantum dots as efficient sources of highly entangled photons: Violation of Bell's inequality without spectral and temporal filtering
著者	Kuroda, Takashi ; Mano, Takaaki ; Ha, Neul ; Nakajima, Hideaki ; Kumano, Hidekazu ; Urbaszek, Bernhard ; Jo, Masafumi ; Abbarchi, Marco ; Sakuma, Yoshiki ; Sakoda, Kazuaki ; Suemune, Ikuo ; Marie, Xavier ; Amand, Thierry
e-Rad_Researcher 00272659 著者名 Kuroda, Takashi
e-Rad_Researcher 60391215 著者名 Mano, Takaaki
著者名 Ha, Neul
著者名 Nakajima, Hideaki
e-Rad_Researcher 70292042 著者名 Kumano, Hidekazu
著者名 Urbaszek, Bernhard
著者名 Jo, Masafumi
著者名 Abbarchi, Marco
e-Rad_Researcher 60354346 著者名 Sakuma, Yoshiki
e-Rad_Researcher 90250513 著者名 Sakoda, Kazuaki
e-Rad_Researcher 00112178 著者名 Suemune, Ikuo
著者名 Marie, Xavier
著者名 Amand, Thierry
言語	英語
発行日	2013-07-18
出版者	American Physical Society
収録物名	Physical Review B
巻(号)	88(4)
ページ	041306-1-041306-5
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	©2013 American Physical Society
PISSN	1098-0121
EISSN	1550-235X
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1103/PhysRevB.88.041306