Observation of strongly entangled photon pairs from a nanowire quantum dot

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DOIResolve DOI: http://doi.org/10.1038/ncomms6298
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TypeArticle
Journal titleNature Communications
ISSN2041-1723
Volume5
Article number5298
Subjectnanowire; quantum dot; electron; nanotechnology; quantum mechanics; theoretical study; birefringence; observational study; photon; polarization
AbstractA bright photon source that combines high-fidelity entanglement, on-demand generation, high extraction efficiency, directional and coherent emission, as well as position control at the nanoscale is required for implementing ambitious schemes in quantum information processing, such as that of a quantum repeater. Still, all of these properties have not yet been achieved in a single device. Semiconductor quantum dots embedded in nanowire waveguides potentially satisfy all of these requirements; however, although theoretically predicted, entanglement has not yet been demonstrated for a nanowire quantum dot. Here, we demonstrate a bright and coherent source of strongly entangled photon pairs from a position-controlled nanowire quantum dot with a fidelity as high as 0.859±0.006 and concurrence of 0.80±0.02. The two-photon quantum state is modified via the nanowire shape. Our new nanoscale entangled photon source can be integrated at desired positions in a quantum photonic circuit, single-electron devices and light-emitting diodes.
Publication date
PublisherMacmillan Publishers
LanguageEnglish
AffiliationNational Research Council Canada; Information and Communication Technologies
Peer reviewedYes
NPARC number21275475
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Record identifier4ba836d0-4f96-4f58-b269-ecca5367b2a2
Record created2015-07-14
Record modified2016-11-15
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