Entangled photon pairs from semiconductor quantum dots

N Akopian, N H Lindner, E Poem, Y Berlatzky, J Avron, D Gershoni, B D Gerardot, P M Petroff

Research output: Contribution to journalArticlepeer-review

810 Citations (Scopus)


Tomographic analysis demonstrates that the polarization state of pairs of photons emitted from a biexciton decay cascade becomes entangled when spectral filtering is applied. The measured density matrix of the photon pair satisfies the Peres criterion for entanglement by more than 3 standard deviations of the experimental uncertainty and violates Bell's inequality. We show that the spectral filtering erases the "which path" information contained in the photons' color and that the remanent information in the quantum dot degrees of freedom is negligible.

Original languageEnglish
Article number130501
Number of pages4
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 6 Apr 2006


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