Abstract

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.

Keywords

PhysicsQuantum entanglementPhotonPhoton entanglementPolarization (electrochemistry)BiexcitonQuantum mechanicsDensity matrixQuantum dotDegrees of freedom (physics and chemistry)Quantum

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Publication Info

Year
2006
Type
article
Volume
96
Issue
13
Pages
130501-130501
Citations
865
Access
Closed

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Cite This

N. Akopian, Netanel H. Lindner, Eilon Poem et al. (2006). Entangled Photon Pairs from Semiconductor Quantum Dots. Physical Review Letters , 96 (13) , 130501-130501. https://doi.org/10.1103/physrevlett.96.130501

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DOI
10.1103/physrevlett.96.130501