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