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Paper detail

Symmetric quantum dots as efficient sources of highly entangled photons

An ideal source of entangled photon pairs combines the perfect symmetry of an atom with the convenient electrical trigger of light sources based on semiconductor quantum dots. We create a naturally symmetric quantum dot cascade that emits highly entangled photon pairs on demand. Our source consists of strain-free GaAs dots self-assembled on a triangular symmetric (111)A surface. The emitted photons strongly violate Bell's inequality and reveal a fidelity to the Bell state as high as 86 (+-2) % without postselection. This result is an important step towards scalable quantum-communication applications with efficient sources.

preprint2013arXivOpen access
T. KurodaT. ManoN. HaH. NakajimaH. KumanoB. UrbaszekM. JoM. AbbarachiY. SakumaK. SakodaI. SuemuneX. MarieT. Amand
cond-mat.mes-hallquant-ph
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T. KurodaT. ManoN. HaH. NakajimaH. KumanoB. UrbaszekM. JoM. AbbarachiY. SakumaK. SakodaI. SuemuneX. MarieT. Amand

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