Entangled photon pairs from semiconductor quantum dots

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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Veröffentlicht in:Physical review letters 2006-04, Vol.96 (13), p.130501-130501, Article 130501
Hauptverfasser: Akopian, N, Lindner, N H, Poem, E, Berlatzky, Y, Avron, J, Gershoni, D, Gerardot, B D, Petroff, P M
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container_end_page 130501
container_issue 13
container_start_page 130501
container_title Physical review letters
container_volume 96
creator Akopian, N
Lindner, N H
Poem, E
Berlatzky, Y
Avron, J
Gershoni, D
Gerardot, B D
Petroff, P M
description 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.
doi_str_mv 10.1103/PhysRevLett.96.130501
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