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

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/59632

Title: Symmetric quantum dots as efficient sources of highly entangled photons: Violation of Bell's inequality without spectral and temporal filtering
Authors: Kuroda, Takashi Browse this author →KAKEN DB
Mano, Takaaki Browse this author →KAKEN DB
Ha, Neul Browse this author
Nakajima, Hideaki Browse this author
Kumano, Hidekazu Browse this author →KAKEN DB
Urbaszek, Bernhard Browse this author
Jo, Masafumi Browse this author
Abbarchi, Marco Browse this author
Sakuma, Yoshiki Browse this author →KAKEN DB
Sakoda, Kazuaki Browse this author →KAKEN DB
Suemune, Ikuo Browse this author →KAKEN DB
Marie, Xavier Browse this author
Amand, Thierry Browse this author
Issue Date: 18-Jul-2013
Publisher: American Physical Society
Journal Title: Physical Review B
Volume: 88
Issue: 4
Start Page: 041306-1
End Page: 041306-5
Publisher DOI: 10.1103/PhysRevB.88.041306
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.
Rights: ©2013 American Physical Society
Type: article
URI: http://hdl.handle.net/2115/59632
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 熊野 英和

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