Entangled photon pairs from semiconductor quantum dots

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 deviati...

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Bibliographic Details
Published inPhysical review letters Vol. 96; no. 13; p. 130501
Main Authors Akopian, N, Lindner, N H, Poem, E, Berlatzky, Y, Avron, J, Gershoni, D, Gerardot, B D, Petroff, P M
Format Journal Article
LanguageEnglish
Published United States 07.04.2006
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Summary: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.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.96.130501