Entangled photon pairs from semiconductor quantum dots.

By N. Akopian, N. Lindner, E. Poem, Y. Berlatzky, J. Avron, D. Gershoni, B. Gerardot, P. Petroff. Physical Review Letters, 2005

730 citations recorded by the source corpus.

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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Cognitive Neuroscience

View Paper: https://www.semanticscholar.org/paper/7bed51474b8e76028d71d7343cd22ccd9e2e05cd

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Citations in the corpus

Nuclear spin physics in quantum dots: an optical investigation (2012, background): “For example, knowing the exact polarization basis is crucial when evaluating the degree of entanglement of a source of photon pairs based on optical transitions from the conduction to valence state in a single quantum dot (Akopian et al., 2006; Dousse et al., 2010; Stevenson et al., 2011).”
Multiphoton entanglement and interferometry (2008, neutral): “4 (Stevenson et al., 2006; Young et al., 2006; Akopian et al., 2006), also emerge.”
Hybrid semiconductor-atomic interface: slowing down single photons from a quantum dot (2011, neutral): “x = A g1 v1 − v− ig + g2 v2 − v− ig ( ) (2)”
Experimental demonstration of a heralded entanglement source (2010, neutral): “15 (70/30), the average coincidence counts (ns, nt) observed for 10 h are (37, 9,710), (37, 4,940) and (14, 1,347), respectively.”
Cascaded single-photon emission from the Mollow triplet sidebands of a quantum dot (2011, background): “Semiconductor QDs have demonstrated single- [12], entangled- [13, 14] and heralded-photon sources [15] but mostly under non-resonant excitation schemes.”